THE WIND GOD AND THE DESCENT OF THE TZITZIMITL: NEW INSIGHTS ON THE ICONOGRAPHY AND PROVENANCE OF THE MOSAIC-ENCRUSTED BIRD HEAD AT THE FRIEDENSTEIN PALACE, GOTHA, GERMANY

Abstract The Friedenstein Palace in Gotha, Germany, holds a Late Postclassic Mesoamerican bird head sculpture made of wood encrusted with precious stone and shell mosaic. Although known since the nineteenth century, scholars have not given the artifact the attention it deserves. Based on observations made during a thorough in situ inspection, we provide a detailed description of the object, stressing both technological and aesthetic aspects, documented through new photos and reconstructive drawings prepared by Nicolas Latsanopoulos. Then, we offer an interpretation of the artifact's iconography, demonstrating it should be understood as a representation of the Wind God in its manifestation as a Tzitzimitl, a category of deities associated with creation and destruction; an aspect made evident in the small figure adorning the avian forehead. We finally reconstruct the collection history of the object, suggesting that the Giustiniani family, a prominent Roman noble family renowned for its collecting activities, once owned the sculpture; in turn, this proposal might imply that the Dominican friar Domingo de Betanzos brought the mosaic to Italy in 1532 and that it might be originally from the Puebla-Tlaxcala Valley or, more broadly, from the south-central area of the modern state of Puebla.


INTRODUCTION
The Friedenstein Palace in Gotha, Germany, holds under the inventory number Eth7R one of the most astonishing extant mosaic-encrusted Mesoamerican objects of its kind, at first sight apparently representing the head of a long-beaked bird. Despite its extraordinary craftsmanship, the artifact has been largely overlooked by scholars in the last 100 years, with the exception of a recent notable contribution (Schwarz 2013) and its latest inclusion in an international exhibition and catalog on Aztec art (Berger 2019). Based on a meticulous visual inspection of the object carried out by the authors in July 2019, this article provides additional information regarding the artifact's collection history and its possible identification and meaning, as well as new images and a detailed description facilitating a new understanding of the piece.

PRIOR REFERENCES AND STUDIES
The earliest direct record of a mosaic-encrusted bird's head sculpture in the Gotha collections is an entry in the second volume of the 1840 Inventarium der Herzogl. Kunst-Kammer auf Friedenstein. In the section on American objects, entry number 14 on page 64 reads: "The upper part of a bird's head, manufactured of mahogany and covered with pieces of turquoise, malachite, red coral, and mother-of-pearl" (Das Obertheil von dem Kopfe eines Vogels aus Mahagoniholz verfertigt und mit Türkisen, Malachit, rothen Korallen und Perlmutterstückchen besetzt) (Anonymous 1840: vol. II, p. 64). The entry also states the object had been recorded in a now-lost 1830 inventory of the same collection and it was "bought by valet Buttstädt in Rome." The same description, together with the reference to the 1830 inventory (now stating that the object was recorded in entry 93, folio 58), is repeated in a later inventory of 1852. A few years earlier, in 1846, another Kunst-Kammer inventory was published by Bube (1846:68), in which the author stated, "Although it was bought in Rome, it probably originated from a Mexican idol," thus asserting for the first time the correct cultural attribution of the artifact. Both the 1830 and 1840 inventories were carried out during the dukedom of Ernst I of Saxe- Coburg-Gotha (1826-1844. Nevertheless, the references to valet Buttstädt and to Rome make clear that the arrival of the object in Gotha was related to his predecessor, Friedrich IV, who became Duke of Saxe-Gotha-Altenburg in 1822 and who,

PHYSICAL FEATURES AND ICONOGRAPHY
Most authors who have discussed the Gotha piece simply state that it represents a bird's head, with no further indication of the avian species and its possible symbolism; only Andree (1889:128-129) has proposed it might be a woodpecker or a crow. Another line of interpretation identifies the object as the head of the Nahua Wind God, Quetzalcoatl Ehecatl. Our description and analysis of the physical features of the piece and its iconography enable us to provide a more thorough interpretation of it as a sculpted image of the Postclassic Nahua and Mixtec Wind God and culture hero-generally known in these societies as Quetzalcoatl Ehecatl and 9-Wind-as well as to characterize the specific aspects of this entity manifested in this particular representation. This in-depth study led us to request our colleague, an expert in archaeological art, Nicolas Latsanopoulos, to recreate the original appearance of the Bird Head sculpture in a series of drawings included in the present article. We invite readers to refer to them, with the caveat that, due to the fragmentary character of some sections of the mosaic, the proposed reconstruction is hypothetical in some respects and inspired by what we observed in the rest of the artifact (compare Figures 2-4).
The sculpture is made of a single piece of wood (length = 30 cm, height including the top wooden knob = 13.5 cm, and width = 16.5 cm), which presents a few cracks that were consolidated at some point, but remain visible on its inner surface and even in specific areas of its outer surface-for example, on the right side of the top of the head, from the back edge of the sculpture to the upper part of the eye socket (right and left are meant from the point of view of the bird, not of the viewer) (Figures 3,5,and 6). Although the earliest available reference to the object (1840 inventory) states the wood is mahogany, it appears to be an unfounded guess; lack of scientific studies precludes the identification of the origin of the wood support. Furthermore, it is worth remembering that analyses of other Mesoamerican mosaic-encrusted wood sculptures in the British Museum revealed that most of them were carved of Cedrela odorata, with two exceptions: a shield made of Pinus sp. and a small animal head carved of Erythrina coralloides (Cartwright et al. 2012:7-12;McEwan et al. 2006:35). The visual appearance of the Bird Head's wood suggests it could be Cedrela odorata.
The outer surface of the wood piece was carefully carved to create a shape suggesting a bird head with a long, sharp bill in the front, with anthropomorphic and fantastic features (Figures 3  and 4). A prismatic protuberance topped by a volute starts between the eyes and projects on top of the bill. The eyes, in turn, were deeply cut in the wood's surface making it so thin that it cracked in the lower part of the left eye socket, where a tiny fragment of wood is now missing (Figures 4 and 7a). Other parts of the head, for instance the eyebrows, the edges of the bill, and the "lips" were also delicately outlined through woodcarving. The top of the head is crowned by a flat wooden bar, devoid of any mosaic, with a trapezoidal knob in the center. On the right side, this bar has a notch that might have resulted from a blow to the piece, which probably produced the above-mentioned crack. At the back of the head, just below the edges of the wooden bar, there is a perforation on each side (Figures 3-5). The piece of wood was cut out in its interior to produce a concave opening when seen from below or the back. The inner surface was roughly hewn and shows the wedge-shaped marks left by the sculptor's tools (Figure 6), as in other sculptures of this kind (McEwan et al. 2006:40). Given the hollowed out opening in the back, the artifact has been repeatedly interpreted as a mask as discussed below, but the hollow part is far too narrow and not at all flat as to allow its placement on a human face (Figures 6 and 8).
Almost the entire outer surface of the wood was covered in mosaic. The 1840 inventory indicates it was made of turquoise, malachite, red coral, and mother-of-pearl. Although the constituent materials of this piece have not been scientifically analyzed, clearly the green palette of the mosaic includes turquoise and some of the various minerals known as cultural turquoise (such as chrysocolla, azurite, amazonite, etc.; Weigand 1993:300-303;Weigand et al. 1977:16), as well as malachite, materials often found in other Late Postclassic mosaics (McEwan et al. 2006: 27-30;Melgar Tisoc et al. 2018;Stacey et al. 2012;Thibodeau et al. 2018). The turquoise and/or cultural turquoise are in two tones-a light green and a bright blue-green-while the malachite creates darker zones of green. The light-green and brilliant bluegreen gemstones cover most of the sculpture. The light tone tesserae are irregular in size and shape and cover peripheral areas of the object, filling areas in between forms, thus constituting a sort of background (Figures 7b and 9a). By contrast, the vibrant blue-green tesserae and the dark green ones are smaller, generally square, forming harmonious mosaics principally used to create the designs that compose the figure, as discussed below. Apart from its less meticulous craftsmanship, the light-green mosaic sections are also the areas where we detected a reused tessera-specifically on the left side of the protuberance (Figure 4).
Beyond green gemstones, the mosaic includes other materials that make the sculpture not only polychrome, but also a multimedia artwork (Caplan 2019:14-15; Domenici 2020), which involves shells and organic substances. Based on our visual inspection, we posit that the red tones were not obtained from coral as proposed by early observers; instead, we suggest these tesserae were made of Spondylus sp. shells, as in other Mesoamerican mosaic pieces (Cartwright et al. 2012:12;McEwan et al. 2006:32-34;Velázquez et al. 2014). These tesserae were primarily employed to create specific motifs, as well as the background highlighting an important figure on the forehead (Figure 10a). We have detected two red tones in the Gotha Bird Head. An intense red was used to create the lips seen on the bill, the background of the forehead figure, and various other details, while a lighter tone, tending to pink, was applied on the lower parts of the piece (Figures 3, 4, and 7c). The mosaic also displays two types of white tesserae: a lustrous yellowish white that can be tentatively identified as mother-of-pearl (Pinctada mazatlanica), and a matte white ( Figures 5 and 11), which is probably Strombus sp. based on results from scientifically analyzed specimens (Cartwright et al. 2012:12;McEwan et al. 2006:32-34).
Finally, the mosaic on the artifact includes two types of blackish materials. One appears only in a small black-and-white motif repeated several times on the piece (Figures 5, 9b, and 11). Its appearance is dull and from what is known from other mosaics it might be lignite (McEwan et al. 2006:30). The second blackish material is clearly not mineral in origin and is actually a very dark brown substance with golden reflections, which served to create the fan-shaped areas behind the figure's eyes (Figures 3, 4, and 9a). We believe it might be an application of the adhesive used to make the mosaic, which is seen in the parts where the tesserae are lost. It is worth remembering that on other mosaic-encrusted objects, a resin (in one instance mixed with beeswax) was used to shape three-dimensional details, perhaps originally covered with gold leaf, as on one of the masks and the shield in the British Museum (McEwan et al. 2006:50, 64). Andree (1889:129) suggested the adhesive employed to create the mosaic on the Gotha sculpture might have been asphalt, but analyses performed on similar artworks revealed a predominance of resins extracted from Pinaceae, at times mixed with copal resins extracted from Burseraceae (Bursera sp.; Protium sp.) and beeswax (McEwan et al. 2006:35-37, 40-41;Pecci and Mileto 2017;Stacey et al. 2006). A specific group of Mixtec mosaics shows the use of a visually different material, a gritty cement containing conifer resin, at times mixed with different kinds of wax (Berger et al. 2021;Domenici 2021a;McEwan et al. 2006:37;Montero 1968;Newman 2002;Saville 1922:76).
In addition to the polychrome and multimedia character of the gemstone and shell mosaic, the Gotha head exhibits minute pigment remains. We observed traces of a blue-green pigment on the front edge of the flat wooden bar on top of the head, inside and below an eye socket, and on the inner surface of the piece, while a white pigment was applied in the interstice between the figure's lips. In some instances, the blue-green pigment appears where tesserae were once applied, suggesting its visibility may be due to the loss of the tesserae and the adhesive. This is the case of the wooden bar at the back of the head, which consists of exposed wood except for the narrow frontal edge that was originally covered with blue-green tesserae ( Figure 7d). The situation of the figure's right eye is comparable, since we noted a tiny trace of bluegreen pigment on its lower edge and a blue-green tessera stuck on its upper edge ( Figure 5). This evidence coincides with historical testimonies, which describe objects encrusted with mosaics first being painted, for the artists who applied the gemstones and shells to follow the guidelines outlined with pigments on the wood support (e.g., Toscano 1984:174-175). Interestingly, traces of paint-with pigments such as cinnabar, red ocher, and indigo-based Maya blue-in areas not covered by mosaic have been detected on other specimens (McEwan et al. 2006:47, 50, 53). Additionally, on the lower part of our sculpture, the adhesive used to affix now missing Spondylus tesserae shows a reddish coloration, but we cannot say if the glue was colored or if a red pigment was applied beneath the adhesive; a similar reddish coloration under a missing Spondylus tessera has been noted on the mosaic-covered Yacatecuhtli mask at the Museo delle Civiltà in Rome (Domenici 2020). For comparative purposes, it is worth recalling that hematite-  colored resins were used to attach the teeth of a mask and the double-headed serpent in the British Museum; in those cases, such material was probably aimed at representing the red gum between the teeth (McEwan et al. 2006:50, 57).
At first sight, the most remarkable element of the Gotha sculpture is certainly the bird's bill that spans three quarters of the artifact's length. Its delicate mosaic decoration is primarily based on a pattern of alternating bands of green tones that differs on the upper and lower parts of the bill-that is, above and below the lips-and that is not strictly symmetrical on the right and left sides of the head. On the rear "half" of the bill, the upper part has four bands-more or less rectangular-of blue-green and lightgreen mosaic, which alternate in a neat chromatic rhythm, but are not symmetrical on the two sides of the object (compare Figures  The Wind God and the Descent of the Tzitzimitl 3 and 4). In this upper section, the work is particularly meticulous: the tesserae are often nearly squared, and most are smaller than those on the lower part-as in the rest of the mosaic, however, the blue-green tesserae are decidedly smaller than the light-green ones (Figures 3, 4, and 9b). In contrast, light-green tesserae predominate in the lower section of the bill where the irregularity in tesserae size and shape stands out. The pattern of bands is subtler here, for light-green bands alternate with darker and somehow multicolor bands, in which a predominantly light-green mosaic is spotted with dark green and blue-green tesserae (Figures 3, 4, 7c, and 9b). In general, the lower part of the bill and the peripheral zones of the piece display less care in their execution, as illustrated, in particular, by the size and shape of the tesserae. In fact, the darker bands in the lower part of the bill were perhaps manufactured with the leftover tesserae after the creation of the principal sections of the object.
On the front "half" of the bill, the decoration increases in complexity, incorporating bands of malachite that along with the bands of blue-green and light-green tesserae create the following chromatic pattern: blue-green, dark green, light green, blue-green, dark green (Figures 3, 4, and 9c). The preservation of these tesserae bands deteriorates moving toward the tip of the bill: only one tessera remains in the last band of malachite on the left side and a few on the right side, while the end of the bill is now completely bare ( Figure 9c). Our close examination of the object, however, revealed that on the immediate edge of the last-almost completely lostband of malachite, the remaining adhesive retains traces of the tesserae that were once affixed there. If we follow the chromatic pattern created by the bands of different green tones in this section of bill, this last band of tesserae should have been light green, a hypothesis consistent with the large size of the marks left by the missing tesserae on the adhesive. The very tip of the bill, in contrast, does not hold any clue that could lead us to determine its original appearance; however, the color sequence observed in this section again suggests it might have been covered by blue-green tesserae.
Besides its band decoration, the bill of the Gotha sculpture also had red (Spondylus), black (lignite?), and white (mother-of-pearl and Strombus shell?) tesserae, introducing some naturalistic features in this section, while enhancing the beauty and impact of the whole piece, for this masterful blend of materials turns it into a veritable polychrome masterpiece. In particular, large elongated Spondylus tesserae-virtually all lost on the lower part of the bill, although their marks remain on the adhesive-represent the lips (Figures 3, 4, 9b, and 9c). This red portion of the mosaic thus outlines the figure's mouth, which is almost closed with only a narrow interstice dividing the upper and lower lips, where we observed vestiges of a white pigment. We should emphasize that although the mouth is particularly long-and remarkable in the object, due to the chromatic contrast between the green tesserae of the bill and the red of the lips-it does not reach the tip of the bill. In fact, the last and almost completely lost bands of tesserae originally wrapped themselves like ribbons around this protruding tip, without any interruption by the red tesserae of the lips-although, in this section, the interstice between the lips was carved and is still visible in the wood support (Figures 3 and 9c). At the other end of the bill, connecting the upper and lower lips, curved segments of red mosaic are made of a unique semi-circular Spondylus tessera on the right side and three triangular ones on the left side (Figures 3, 4, and 9b).
Right beside these curved sections, the lower part of the mouth has wider zones of irregular red tesserae evoking gums where teeth were added below (Figures 3, 4, and 9b). Only one of the teeth was preserved on the right side of the head, but thanks to the marks visible on the adhesive we know that three of them were originally placed on each side. The remaining tooth is made of a unique tessera of white shell that exhibits a vertical incision on the lower part ( Figure 9b). This said, while the irregular appearance of these red sections of the mosaic evokes the texture of gums, the original rows of three teeth seem to emerge, in a counterintuitive way, from the lower edge of the lower lip/gum, instead of being placed over it as one would expect. In our view, this should be interpreted as a stylistic convention, since a similar configuration is seen on the Copenhagen Xolotl head, pertaining to the same stylistic "family" of mosaics (Domenici 2020). Additionally, the intentional use in these specific sections of the mouth of small, irregular Spondylus tesserae instead of the usual, rectangular elongated ones might suggest another identification. Indeed, this technical detail, as well as the apparently erroneous representation of the teeth beneath the lower lip, lead us to suggest that these red sections over the teeth do not represent gums or part of the lower lip, but rather the sagging, scalloped edge of the upper lip, which is a distinguishing trait of Ehecatl (Figure 12b), also seen on Xolotl, for example in the Codex Borgia (Anders et al. 1993b:Plate 65).
Moving toward the front part of the bill, after these sections of sagging lips and teeth, both sides of the sculpture display small areas in which all the tesserae are lost (Figures 3, 4, and 9b). The marks on the adhesive, however, reveal that these areas perhaps included another series of tesserae referring to the flaccid upper lip of Ehecatl-because these sections are of similar dimensions to those of the preserved areas discussed above-and a large single tessera. On the left side, it had a rectangular shape and might have been another tooth, but on the other side of the head the mark left by the corresponding tesserae shows a puzzling large rounded shape (Figure 9b). Other enigmatic sections are The Wind God and the Descent of the Tzitzimitl the rectangular areas at the very bottom of the head, slightly behind the bill. These areas were encrusted with large irregular pinkish tesserae that are almost completely lost on the right side of the head and fortunately better preserved on the left side ( Figure 7c); the adhesive where the mosaic is missing shows a reddish hue.
As we have shown, the multiple colors and diverse materials used in the decoration of the Gotha Bird Head served to outline naturalistic features, while they transformed the piece into a polychrome work highly valued and prized by its creators (Dupey García 2021). This polychromy is the hallmark of a specific style in extant mosaic objects-probably developed in a specific region, period, or by certain artistic schools or workshops-that is represented in only one of the "family" of mosaics held in early European collections (Domenici 2020). Moreover, not only the multimedia and polychrome character of the Gotha mosaic-encrusted sculpture, but likewise some specific motifs in its decoration are found in this specific "family" of Postclassic, central Mexican mosaics. This is the case of three ornamental designs employed along the bill: the polychrome series of disks, the stellar eye, and what we call the black-and-white motif. The polychrome series of disks, which the senior author interpreted elsewhere as qualifying the object as "precious" (Domenici 2020), can cluster two, three, and even four round tesserae-or, more rarely, groups of tiny tesserae that form disks-made of different materials and colors, some of which are missing today. The lower part of the bill presents groups of only two disks. In the upper part of the bill, where the decoration is richer, a missing series of disks was originally located on the ridge, right in front of the prismatic protuberance, while others are placed right above the upper lip, in what seems to be a continuous line of disks following the shape of the bill (Figures 3 and 4). A closer look at this section, however, reveals that each series of three or four disks is included in a specific band of the green toned mosaic ( Figures 3, 4, 9a, and 9b), thus increasing the complexity of this decoration with the introduction of other media, multiple colors, and the various manifestations of shine generated by the gemstones and shells.
Sometimes, one of the disks in these polychrome series is replaced by a more complex motif that is well-known in Postclassic imagery and commonly called "stellar eye." On the bill, it appears as part of the series of disks on the upper lip (Figures 4), but it also occurs alone, for example in the dark green mosaic "ribbon" at the tip of the bill (Figure 9c). The stellar eye is round or oval in shape and is composed of a red "half" made of Spondylus and a white "half" made of shell, in which a three-quarter circle is traced in black (Figures 3, 4, and 9b). In the Gotha Bird Head as well as in other mosaic-encrusted objects from the same stylistic "family," this three-quarter circle was incised into the white shell and filled with a black substance, probably the adhesive used to glue the tesserae. This manufacturing technique, already noted by McEwan and colleagues (2006:76) on a knife in the British Museum, is clearly visible in those instances where the adhesive filling is completely or partially lost, revealing the carved groove (Figures 9b, 9c, and 11). The third decorative motif on the Gotha sculpture-as well as on other mosaic-encrusted artworks of the same "family"-is one that we call the black-and-white motif, for it alternates small black-and- white square tesserae in a line, usually two white ones made of shell and three black ones, perhaps made of lignite. Interestingly, this black-and-white motif, which the senior author tentatively interpreted elsewhere as qualifying the marked areas as "shiny" (Domenici 2020), is always inserted in red lines of Spondylus tesserae (Figures 3-5, 9b, and 11). On the figure's lips, this pattern is repeated twice on each side; in one instance, on the right side of the head, only a single black tessera is still in place. In these cases, the black-and-white motif probably alludes to the wet, and thus shiny, surface of the lips.
Another exceptional component of the sculpted figure, highly significant for its identification, is the prismatic protuberance between the eyes, projecting upward and forward reaching the middle of the bill (Figures 3, 4, and 11). In terms of ornamentation, it is mainly organized in two sections. On the front section, the symmetry between both sides is striking and the decoration is again based on a series of bands, juxtaposing from front to back: a band of tiny blue-green tesserae, a band of small and almost-square dark green tesserae, a band of elongated mother-of-pearl tesserae, a band of elongated Spondylus tesserae-within which is inserted, on each side, the black-and-white motif-and another band of bluegreen tesserae. In this section, few tesserae of the red and white bands of Spondylus and mother-of-pearl have survived, while the turquoise and malachite mosaics stand out for their masterful execution, probably the finest in the piece (Figure 11). At half of their height, these vertical bands display some of the decorative elements characteristic of the piece: the black-and-white motif, the stellar eye and a series of three contiguous disks-on the left side, the series juxtaposes mother-of-pearl, Spondylus, and mother-of-pearl, a composition which is inverted on the right side, where we find Spondylus, mother-of-pearl, and Spondylus. Finally, the narrow, trapezoidal front of the protuberance was encrusted with a mosaic composed of small, almost-square, blue-green tesserae, which is now severely damaged with only the lower area intact, where a round tesserae, also lost, was originally placed.
The back sides of the protuberance, closer to the eyes, bear particularly interesting motifs. At the top, a mother-of-pearl volute is surrounded by a blue-green mosaic, on top of which a disk-shaped tessera was originally encrusted. On the left side of the head, the mother-of-pearl volute is bigger and made of two tesserae, while on the right it was created from a single tessera (Figures 4 and 11). As for the lower zones of both sides of the protuberance, where it joins the bill, they exhibit a semi-circular motif elaborated with two concentric lines of tesserae, one of white shell and the other of Spondylus. The interior of this half circle is filled with bluegreen tesserae and a disk-shaped mosaic of the same material is placed on top of it. The "background" of all these motifs is a mosaic of light-green tesserae ( Figure 11).
The protuberance over the bill and several elements of its decoration are critical for the figure's identity. In fact, a sharp bill associated with a rectangular protuberance projecting toward the front is typical of multiple painted and sculpted images of the Postclassic Nahua and Mixtec Wind God-principally known as Quetzalcoatl Ehecatl and 9-Wind ( Figure 12)-who was one of the principal demiurges and culture heroes in these societies. The prominent buccal mask, as it is often called, of this divine character has been described since early colonial times, and the sixteenthcentury Codex Tudela, in particular, stresses that the Wind God gave rise to the wind when he blew through this appendage (Batalla Rosado 2002:f. 42). More recently, scholars have studied how the Mesoamerican Wind God's bill matches the physical features of different birds, especially ducks, whose habitats and conduct also connect them to the wind (Espinosa 2001;O'Mack 1991;Taube 2004:169-173). While it is likely that the Wind God's images were inspired by different animals, it is worth noting that Whitley (1973), followed by Pohl and Lyons (2010: 85), identified the deity's protuberance on top of the bill as a trait of the Muscovy duck (Cairina moschata), characterized by a prominent red caruncle over its bill. Interestingly, the Muscovy duck emits a hiss-like vocalization whose blend of breath and sound might have been equated with the Wind God's gusts by Mesoamerican peoples, who also consumed this animal either wild or domesticated (Gade 2000; Whitley 1973).
The Gotha sculpture is of little help in further clarifying the identification of the Wind God with a specific bird, but it is striking that the protuberance on the figure's bill is crowned by a volute that is clearly a reference to the wind (Dupey García 2020;Espinosa Pineda 1997;Taube 2001), as well as to the Wind God's ability to blow the wind through his bill. The mother-of-pearl volute, indeed, suggests that from the "block" formed by the bill and its protuberance the wind is blown and flows upward. Significantly, a similar volute can be observed on top of the buccal mask of wellknown Wind God stone sculptures, such as the Coronation Stone of Moctezuma II (McEwan and López Luján 2009:69) or the fulllength statue from Calixtlahuaca (Estado de México, Mexico) now on display in the Museo de Antropología e Historia de Toluca ( Figure 12a). As for the half circles composed of lines of white shell and Spondylus tesserae and filled with a blue-green mosaic on the lower part of the protuberance (Figure 11), they also confirm the identification of a Wind God's image whose creation was aimed at evoking blowing air in multiple ways (Dupey García 2020). In fact, the representations of this deity in many pre-Columbian Mixtec and Borgia Group manuscripts are figures in which the bill's protuberance is separated from the bill and converted into the god's nose, whose essential function of breathing is accentuated by the addition of nostrils (Figures 12b and 12c; Anders and Jansen 1994:Plates 1, 6, 23, 32;Anders et al. 1992a:Plates 10, 24, 31, 34, 36, 38, 47, 48, 1992b:Plates 38, 65, 1993b:Plates 9, 40, 51, 72, 73, 1994a. In these images, the nostrils are depicted as quarter circles and positioned in the same location as the half circles in the Gotha artifact; consequently, we interpret the latter as possible representations of the god's nostrils from which he exhaled air. The identification of the Gotha sculpture as an image of the Wind God is further strengthened by the analysis of other decorative elements displayed in the piece. In particular, the blue-green mosaic disks on top of both "nostrils" may be explained on the basis of several representations of the Nahua and Mixtec Wind God in stone or gold and painted in manuscripts. Indeed, in the Calixtlahuaca sculpture (Figure 12a), the pair of "Atlantean" sculptures found on the Calle de las Escalerillas in Mexico City, or the squatting sculpture in the Museo Nacional de Antropología also in Mexico City, the deity exhibits two tubular appendages on the sides of his bill's protuberance, which might refer to the air blown by the Wind God from his "nares." This proposal is supported by depictions of Quetzalcoatl Ehecatl in the codices Magliabechiano and Tudela, and also in a Mixtec gold earplug, where a tubular form topped by a precious bead emerges from the god's nostrils (Figure 12e; Anders 1970:ff. 7v, 11v, 61r, 78r;Batalla Rosado 2002:ff. 42r, 49r, 88r;McEwan and López Luján 2009:102). These "tubes" could be reminiscent of the chalchihuitl nose-plug that horizontally crossed the nose of Quetzalcoatl Ehecatl in pre-Hispanic codices, such as the Codex Borgia (Anders et al. 1993b:Plates 9, 23, 56, 60), although we are not certain that they are depictions of this specific jewel. Rather, we regard both the horizontal nose-plug and the tubes along the protuberance/nose of the Wind God as variations of a widespread Mesoamerican visual metaphor: the materialization of precious breath emitted from the nostrils (Houston and Taube 2000;Houston et al. 2006:141-152). And we posit that the depiction of such tubes on the two-dimensional mosaic of the Gotha sculpture could have taken the form of disks.
Other diagnostic elements are the rows of white teeth, which are seen in an image of Quetzalcoatl Ehecatl in the Codex Borbonicus (Figure 12d; Anders et al. 1991:Plate 22), while in this and other codices the god frequently displays a bill full of sharp teeth or a single canine protruding in the bill commissure (Figures 12b, 12c, and 12e; e.g., Anders et al. 1991:Plate 5, 1993b. Finally, if we are correct in interpreting the section of uneven Spondylus tesserae over the rows of three teeth in the Gotha Bird Head as the typical scalloped, sagging edge of the upper lip of Quetzalcoatl Ehecatl-as depicted, for example, in the Codex Borgia (compare Figures 3 and 12b; Anders et al. 1993b:Plates 16, 19, 72)-this might be another one of the god's distinctive features.
The eye areas in the Gotha sculpture have two, almond-shaped eye sockets carved out of the wood support (Figures 3, 4, and 7a), which are now devoid of any decoration except for a tiny, blue-green tessera on the upper edge of the figure's right eye socket ( Figure 5). This unique trace, already noted by Schwarz (2013:36), suggests that the edges of the eyes were once decorated with small blue-green tesserae. Otherwise, we have no clue regarding the original elements in the eye sockets. It is probable, however, that large pieces of brilliant materials, such as pyrite, were placed there and outlined by a thin, blue-green mosaic decoration. Such an arrangement would be similar to that of the mosaic-encrusted human skull today in the British Museum, where two pyrite orbs are delineated by pieces of white Strombus shell. Colonial accounts, such as Díaz del Castillo's (1956:219-220; Bassett 2015:146) chronicle, confirm that sculptures of the Nahua gods could be "covered with precious stones, and gold and pearls, and with seed pearls stuck on with a paste" and had "eyes that shone, made of their mirrors," which were made of pyrite or obsidian. The hypothesis of large elements used in the eyes is also reinforced by the complete loss of the decoration of the two eyes-with the exception of the minuscule, blue-green tessera. Andree (1889:129) suggested that the original ornaments might have been purposely detached because of the value they had for the piece's former owners. Other hypotheses could also be raised, such as the insertion of eyes during the manufacture of the Nahua gods' embodiments to give them identity and agency (Bassett 2015), and conversely their possible removal when their human creators wanted to inactivate them.
Below each eye, we again discern a decoration composed of a series of parallel bands, reminiscent of the band or bands sometimes seen under the eye of Quetzalcoatl Ehecatl-or crossing it-in the codices Magliabechiano and Tudela (Figure 12e; Anders 1970:ff. 7v, 11v, 61r, 78r;Batalla Rosado 2002:ff. 42r, 49r, 88r). Close to the protuberance, two of them are still visible: a blue-green band, well-preserved on both sides, and a dark green one. In contrast, the two bands in the middle are completely lost today, but their existence is confirmed by the marks left on the adhesive (Figure 7e). Near the outer corner of the figure's left eye another line of bluegreen tesserae is still visible (Figures 4 and 7e). Assuming that the pattern of parallel vertical bands seen on the protuberance is repeated under the eye, the two missing bands of mosaic might have been made of elongated mother-of-pearl and Spondylus tesserae, whose preservation is precarious throughout the piece.
Above the eye sockets, the Bird Head exhibits thick double eyebrows. The inner part is formed by a volute made of a dark green malachite mosaic, while the outer section is an even larger volute of blue-green tesserae that coils around the inner volute at the outer corner of each eye (Figures 3-5). This naturalistic element is also crucial for the identification of the figure, since a prominent blue eyebrow is one of the distinctive features of the Wind God in several Pre-Columbian and colonial manuscripts (Figure 12b). It is even found in some synoptic forms of the deity's image representing the day sign ehecatl (wind) in several codices, which include the bill and the protuberance/nose, the god's volute-shaped ear pendants, a single white fang protruding in the bill commissure, and a prominent blue eyebrow (Anders et al. 1991(Anders et al. , 1993b(Anders et al. , 1993c(Anders et al. , 1994b. The back of the head is decorated on each side with an uneven mosaic of light-green tesserae (Figures 3, 4, 7b, and 9a), while on the "jaws" the craftsmanship of the mosaic involved other materials, perhaps another series of bands, as suggested by the marks left on the adhesive. On the left side, malachite is clearly seen flanking a vertical band without tesserae but still visible on the adhesive; on the right side, the situation is more confusing because a few malachite and blue-green tesserae remain, as well as the marks of the former bands of mosaic, again visible on the adhesive, but the distribution of colors is unclear (compare Figures 3 and 4). These peripheral areas also display some of the motifs typical of the Gotha sculpture and the "family" of mosaic-encrusted objects to which it belongs. A stellar eye was included on each "jaw" (Figures 3, 4, and 9b), while each "cheek" shows a series of disks. Specifically, two disks, now lost, were originally placed on the right side of the head, while, on the left, a design inspired by a series of three disks stands out for its irregularity because it is made of various tesserae of different shapes and sizes (Figure 7b).
Behind each eye, the figure exhibits a large, fan-shaped area that was filled-possibly after being outlined by a previous incisionwith a dark brown organic material, most likely the adhesive employed to attach the tesserae (Figures 3, 4, and 9a). The application of this substance creates a contrast between the sheen of the stone and shell mosaic and the opaqueness, though with golden reflections, of the adhesive layer; a contrast that probably heightened the appreciation of this multimedia object. Perhaps this unexpected decorative use of the adhesive also had a symbolic meaning and was intended to suggest that this fan-shaped element filled with an organic material stood for another fan made with organic components. Specifically, we wonder if these designs on the back portions of the Gotha Bird Head represent the Wind God's fan-shaped neck ornament, often fashioned with dark and red feathers (Figures 12b  and 12c). In fact, the neck ornament and the decoration made with the adhesive share their shape and location. Furthermore, on the right side of the Bird Head, the fan-shaped element ends with small trapezoidal areas of dark green malachite mosaic, each with an added red tip made of a single Spondylus tessera (Figure 9a). These mosaic additions to the decoration made with the organic material create a trapezoidal form with flaring tips that recall the composition of dark feathers and sparkles of red characteristic of the Wind God's neck adornment (compare Figures 9a and 12b). Additionally, in the Gotha sculpture, the colors of the fan-shaped element match those of Quetzalcoatl Ehecatl's neck ornament in the codices Laud and Ixtlilxochitl, in which it displays the same hues: black, red, and green or blue-green (Figure 12c; Anders and Jansen 1994:Plate 23;Durand-Forest 1976:f. 103r). Curiously, the pattern of dark green mosaic and red tesserae is conspicuous for its absence on the left side of the Bird Head, making the sculpture notably asymmetric in these areas (compare Figures 3  and 4).
Last but not least, the top of the head and the forehead of the Gotha artifact display a central anthropomorphic figure rendered in a colorful mosaic on a background made of especially large Spondylus tesserae (Figure 10). In the first place, the placement of this figure is meaningful, since in most of the known anthropomorphic and zoomorphic Late Postclassic mosaics-for example, the Yacatecuhtli mask today in the Museo delle Civiltà in Rome, or the masks from the Tehuacán region (Puebla, Mexico) in the National Museum of the American Indian in Washington, DCthe forehead shows some kind of chromatic "enhancement," usually darker than the rest of the "face" (Domenici 2020(Domenici , 2021b. Given the relevance of the forehead as one of the key bodily parts for the expression of the self in Mesoamerican systems of thought (cf. Classic Mayan baah, "forehead," "face," "body," "portrait"; Houston et al. 2006:12, 58-72), the forehead of the Gotha Bird Head could have served as an appropriate functional locus (Salazar 2014; Salazar and Valencia Rivera 2017), where an image that expressed some essential quality of the Wind God was displayed.
The red forehead area is bordered by bright blue-green tesserae on both sides. This visual contrast might have further emphasized the particular significance of this section's iconography, which required an exquisite mosaic of tiny blue-green tesserae, instead of the irregular composition of light-green stones normally used for peripheral areas or to create backgrounds. Enclosed in these blue-green areas we notice a series of three disks on each side, two of which were made of Spondylus on the left, while all are lost on the right (Figure 10a). On the outer edges of these blue-green areas, that is, at the "temples," we see a new series of bands, exceptionally well-preserved on the right side: a white band of mother-of-pearl and a red band of Spondylus, where the black-and-white motif was inserted (Figures 5 and 10a).
We will describe and explain the anthropomorphic figure in the center as seen from the front because this is how it needs to be read in order to unveil its profound meanings ( Figure 10). It is a descending figure typical of Postclassic Mesoamerican iconography: the bent legs are depicted at the top of the bird's head, while the diminutive character's head was designed on the Wind God's forehead, suggesting that the figure is falling headlong. Its limbs were rendered with a delicate malachite mosaic that originally ended with claws denoted by the combination of a Spondylus tessera with a hook-shaped white shell tessera. One of the legs is bent toward the back and the other on the front suggesting movement. The left arm is extended on the side of the figure and originally ended in a claw, now lost, which probably included the same white hook attached to a red base that we see on the right side. Most of the right arm, in contrast, is covered by a pair of large, nestled volutes made of blue-green turquoise and malachite, which stand for the torso of the figure (Figure 10b). The torso area also displays a Spondylus pectoral and a dorsal ornament with two narrow pendants created with tesserae of different colors and shapes. The two nestled volutes, which cannot be associated with any known body adornment, emphasize the twisted appearance of the descending figure.
The Wind God and the Descent of the Tzitzimitl The most exciting part of the falling anthropomorphic figure is undoubtedly the head, which is tipped backward to look up. It is made of a malachite mosaic and clearly shows an ear with an adornment composed of a trapezoidal pendant, both made of mother-of-pearl. The top of the small figure's head also displays two mother-of-pearl tesserae that were carved with curled notches to suggest curly hair. Two series of three minuscule Spondylus and shell tesserae were finely combined to create the gums and teeth of the small figure, which does not have lips and thus displays a fleshless jaw. A stellar eye is seen above the gums, while a mother-of-pearl volute is placed under the teeth, suggesting that the figure is exhaling, blowing, or speaking. Finally, the front part of the head-where the nose should be-exhibits a relatively long and curiously hooked appendage, also made of malachite ( Figure 10). Due to this unusual "nose," the small figure on the forehead was initially identified as a bird with a curved bill, the "stylized figure of a parrot" according to Andree's (1890:148) work, where one of the lithographs shows an appendage more pointed and bill-like than it really is (compare Figures 1 and 10). Schwarz (2013:37), however, has noted that the figure is not actually a real bird because he has limbs. At the same time, Schwarz has highlighted its aggressive features, such as the claws that might connect this character to several categories of harmful beings in Nahua culture. In particular, Schwarz succinctly compared the small figure on the Wind God's head with the Tzitzimime deities-specifically, the one depicted in the Codex Magliabechiano (Anders 1970:f. 76r)-and the Cihuateteo, women who had died in childbirth and were transformed into menacing supernatural beings.
Clearly the small figure on the Gotha sculpture's forehead has a fierce appearance, based not only on its claws but also on its fleshless mandible displaying the teeth. The descending position with the head tipped backward is also interesting, since, in Mesoamerican mythology and iconography, it symbolizes the descent of different types of beings from upper regions of the cosmos, often to attack human communities or as part of cosmogonic narratives. But among the categories of descending beings, the hooked frontal appendage makes the Gotha figure virtually unique. In our view, this protuberance seems too thin and blunt to represent a bird's bill, while its shape is quite unusual for a nose in Mesoamerican iconography. Interestingly, though, beings with similar hooked noses-sometimes coiled, when the hook is rolled onto itselfare seen in the Borgia Group codices, particularly in the enigmatic central section of the Codex Borgia. In this series of plates, as well as in the Codex Cospi, the figures with hooked-or coiled-noses exhibit the same fleshless lower mandible, tangled and curly hair, and claws like the Gotha figure (Figures 13a, 13c, and 14b; Anders et al. 1993b:Plates 29, 31, 1994b:Plates 1-8). Also, the hooked-nose figures in these codices can wear a white ear adornment made of unspun cotton that has the same trapezoidal shape as the ear pendant of the forehead figure (Figure 13c). Finally, in some images in the Cospi, the hair of these beings has the same light color, while, in one instance, this manuscript shows the hooked-nose creature in a descending position with bent legs on the top and the head tipped backward on the bottom (Figure 13a; Anders et al. 1994b:Plate 2). Therefore, we believe that the aggressive-looking figure on the Gotha sculpture might be an expression of a hooked-nose supernatural being that is also seen in these codices. Identifying this being or category of beings is hence critical to understanding why he/she crowns the mosaic-encrusted head of the Wind God and to formulate hypothetical overall interpretations for the piece.

INTERPRETATION The Birth of the Wind God or His Descent as a Tzitzimitl
The interpretation of the descending hooked-nose figure on the Wind God's forehead can be supported by a review of the so-called "central section" of the Codex Borgia (Anders et al. 1993b:Plates 29-46), where creatures with the same nose appear, as well as recurrent figures in falling position. Furthermore, although the content and meaning of the section have been the subject of long-standing debate, what is beyond doubt is that Quetzalcoatl is constantly depicted and evoked in these 18 plates of the Borgia (Nowotny 2005(Nowotny [1961:266; Seler 1963 [1904][1905][1906][1907][1908][1909]). It is unlikely that the joint reference to descent and to these two supernatural figures-Quetzalcoatl and the being with the curious hooked nose-both in the Gotha sculpture and in the Codex Borgia is a coincidence. For this reason, we will examine the occurrences of hooked-or coilednose characters in the central section of this manuscript in an attempt to shed light on their identity and the nature of their relationship to Quetzalcoatl Ehecatl.
The complexity and uniqueness of the central section of the Borgia have given rise to distinct interpretations since the early twentieth century. Following Seler (1963 [1904][1905][1906][1907][1908][1909]:vol. 2, pp. 9-61), several authors have agreed on the narrative quality of the section (see a summary in Boone [2007:171-173]), on the grounds that the protagonists on different pages seem to move from one page to another. Boone (2007:171-210), in particular, has argued that it is a narrative of creation, full of emergence scenes in which Quetzalcoatl, in his multiple guises, plays a central role as one of the major demiurges of Postclassic Nahua and Mixtec cosmogonies. Boone (2007:175-176) also analyzed the presence of hooked-and coiled-nose beings in this section of the Borgia-without dwelling on the curious shape of these appendages, though-where they appear as the structural elements that organize the different episodes of the narrative, first in the form of quadrilateral frame deities and then as strip goddesses (Figures  13c, 14a, and 14b). Summarizing earlier studies, Boone explains that such entities exhibit the features of Death and Earth divinities-in particular, skeletal mouths, tangled hair, and claws instead of hands and feet-while the iconography of the strip goddesses' skirts alludes to darkness, sacrifice, and creation (Boone 2007:176-177, 266). Following in Nowotny's (Nowotny 2005(Nowotny [1961:266-267) footsteps, Boone also underscores that these supernatural beings organize the narrative's episodes and ensure continuity between them. Through the series of bands that form their bodies or through their cut open torsos different figures cross in a descending posture-in several cases, they are manifestations of Quetzalcoatl-and appear to be leaving one scene and entering the next (Figures 13c and 14a).
In the same vein, others scholars have proposed that the strip goddesses in the central section of the Borgia could be images of the sky and its different levels, or of celestial elements such as the Milky Way, and have suggested that the protagonists that pass through these bodies could be circulating between different parts of the cosmos, in particular descending from the Sky to the Earth (Díaz 2016; Jansen and Pérez Jiménez 2017:450;Milbrath 1988: 162-163;Nowotny 2005Nowotny [1961:267; Seler 1963 [1904][1905][1906][1907][1908][1909]: vol. 2, pp. 40-41). Regardless, it is interesting to note that the forehead figure on the Gotha piece-perhaps because of the limited space available for the construction of the image-blends the traits of deities whose bodies are crossed and descending figures that pass through these bodies into a unique being. Indeed, the falling figure on the Bird Head shares a hooked nose with the frame deities and strip goddesses of the Borgia and the two volutes-one nestled inside the other (Figure 10)-that compose the small figure's torso are structurally reminiscent of the repetition of motifs-particularly, spirals and sequences of fleshless ribs-that creates the frame goddesses' bodies in the Borgia (Figure 14a). In other words, this unusual creature apparently merges the identities of two categories of supernatural protagonists seen in the Borgia's narrative: one that crosses and one that is crossed. As a consequence, the small figure on the Gotha piece perhaps refers to the action of descending or passing from one sector of the cosmos to another. This proposal is strengthened by a fragment of the mural paintings of Palace IV at Mitla, where a character in the same position and with curly hair similar to the small figure on the forehead, as well as a facial painting that recalls the distribution of colors on the face of the Wind God clearly descends headfirst from the sky (Figure 13b; Seler 1904Seler :313, 1991Seler [1888:186).
There are, of course, several lines of interpretation to explain why a descending figure with several features of a hooked-nose being was depicted on the forehead of this Wind God sculpture. A first hypothesis we would like to consider is the small descending figure as a reference to the birth or rebirth of this god, for in Mesoamerica, and particularly in Nahua and Mixtec cultures, birth was conceived of as a descent (Milbrath 1988;Olivier 2021). Interestingly, in the previously mentioned Mitla mural, the figure with curly hair and possibly the facial painting of the Wind God is emerging headfirst from a V-shaped cleft in the sky in the typical form of a womb in Postclassic imagery (Milbrath 1988: 155-158); he is also grasping a rope that could be a reference to an umbilical cord (Figure 13b). Furthermore, in the central section of the Codex Borgia, the birth of Quetzalcoatl is evoked twice in a scene where the deity is falling headfirst, exactly in the same posture as the forehead figure (Anders et al. 1993b:Plate 32;Boone 2007:183-185;Díaz 2016:92). In plate 32, the god first emerges from the mouth-womb (Milbrath 1988:160) of a flint knife, placed on the navel of an anthropomorphic figure depicted in birthing position and, second, from the wound-womb (Milbrath 1988:160) of the first strip goddess with a coiled nose seen in the narrative-in this part of the composition, Quetzalcoatl is flanked by two flint knives also placed in the body opening (Figure 13c). Beyond the allusion to descent, we know these images refer to the birth of the deity because Quetzalcoatl's emergence is associated with flint knives, a common mythical motif for deities' origins in Nahua and Mixtec cosmogonies. A Nahua narrative tells that the primordial goddess gave birth to a flint knife, which was dropped from the sky and gave rise to several gods (Mendieta 1993:77-78), while imagery displays the birth of Tezcatlipoca, Quetzalcoatl, and 9-Wind from flint knives (Anders et al. 1992a:Plate 49, 1993bNicholson 1978: 66-68;Nowotny 2005Nowotny [1961; Pohl 1998), one of which was created by a couple of deities with skeletal mouths and claws (Anders et al. 1993a:179).
Additionally, in the first scene of the Borgia's central narrative (Anders et al. 1993b:Plate 29), a dark figure with claws, a fleshless mouth, and a tiny hooked nose also stands in a parturient pose and orchestrates the emergence of a mass of darkness (Boone 2007: 179-181;Díaz 2016:79), from which, in turn, serpentine forms with the iconographic features of the night and the wind come forth, as well as beings of different colors with the Wind God's buccal mask (Figures 14a and 14c). Although the interpretation of such a complex image is of course challenging, we are probably viewing an origin scene that involves a creative entity with a hooked nose and death traits who gives birth to beings associated with the wind. In the lower part of the scene, two black creatures with the Wind God buccal mask-who emerge from night and wind serpents-also cross in a headfirst posture through the cut  open body of a hooked-nose quadrilateral god to enter the following part of the narrative (Figure 14a). In sum, what we see on these pages of the Borgia (Anders et al. 1993b:Plates 29 and 32) are windrelated protagonists-in plate 32, the Wind God himself in a descending posture-being born or emerging from hooked-or coiled-nose beings (other examples are seen on the remaining pages of the section). As a consequence, the fusion of both characters on the forehead of the Gotha Wind God sculpture might be an allusion to the birth of the deity, evoked here through the metaphor of descent and a reference to the being from whom Quetzalcoatl Ehecatl is born, according to the cosmogonic events seemingly depicted in the Borgia. Other significant elements of the scene in Borgia 29 are the two ropes coming from the skeletal creature with the tiny hooked nose, who seems to be creating multiple wind-related beings (Figure 14a). Indeed, we have seen that in the above-mentioned Mitla mural, the figure emerging from a "womb" in the sky and descending headlong also grasps a rope (Figure 13b), while in the cosmogony painted in the Codex Vienna, Quetzalcoatl was born from a flint knife, and descended from the sky using a rope-in this case, the god is not shown falling headlong but walking; however, he is framed by two figures who descend headfirst (Anders et al. 1992a:Plate 48). In the Codex Borgia (Anders et al. 1993b:Plate 29), the beings descending on ropes are spiders (Figure 14a), which should be interpreted as Tzitzimime in this context (Anders andJansen 1996a: 48-49, 1996b:f. 3r;Seler 1901Seler -1902Seler :51-52, 1963Seler [1904Seler -1909: vol. 2, p. 22), a category of deities traditionally identified as descending creatures (Quiñones Keber 1995:f. 4v;Sahagún 1953-1982Thevet 1905:28). Thus, the creation of wind-related beings was associated with the descent of the Tzitzimime on ropes in plate 29 of the Borgia, in the same way that, in plate 48 of the Vienna, the birth of Quetzalcoatl from a flint knife is followed by his descent on a rope from the sky to the earth.
This interpretation makes sense because, according to the Codex Telleriano Remensis (Quiñones Keber 1995:ff. 4v, 18v), Quetzalcoatl was one of the large group of the Tzitzimime divinities, some of whom were the children of the primordial couple and were identified as air deities (Alvarado Tezozómoc 2001:176, 262), but who also stand out for their ambivalent and changing nature (Klein 2000;Pohl 1998). Following the seminal work of Thompson (1934), the junior author of this article has analyzed their ambivalent participation in Nahua mythology (Dupey García 2010), at times as creators of the world who saw to its stabilityas sky bearers (Alvarado Tezozómoc 2001:176, 180, 262, 291;Boone 1999;López Austin and López Luján 2009:450-461)and who were providers of all sorts of natural and cultural goods, and at other times as the destroyers of life on earth, bringing illness and war, and devouring humans. To carry out both types of actions they descended from the sky, sometimes on ropes made of spiders' webs (Torquemada 1975-1983). In the case of Quetzalcoatl, we see him descending-headfirst or walking on a rope-in the cosmogonies depicted in the Codex Vienna and probably also in the Codex Borgia (Anders et al. 1992a:Plate 48, 1993b, while in the Codex Vaticanus A he is shown diving down to drive the world to its ruin (Anders and Jansen 1996b:f. 6r;Díaz 2016:88-90).
Returning to the sculpture in the Friedenstein Palace's collections, the definition of the ambivalent Tzitzimime and Quetzalcoatl belonging to this group lead us to formulate a second complementary hypothesis regarding the figure represented on the forehead. Its descending position and iconography, blending Earth and Death gods' attributes, suggest it might refer to the birth of the Wind God and his emergence in the world as well as to his Tzitzimitl nature and his cosmogonical actions and destructive behaviors. This explanation is supported by the small figure's claws and fleshless mouth, which are features of creation godsthe latter, for example, is a trait of the Mixtec primordial couple and parents of 9-Wind (Anders et al. 1992a:Plate 51;Furst 1982;Nicholson 1978:66)-while they are also typical of menacing divinities who harm humans. This second hypothesis might explain why the small forehead figure seems to merge the traits of two protagonists seen in the central section of the Borgia: he combines the descending position of the deities, Quetzalcoatl in particular, moving through different levels of the cosmosevoked by cut bodies-with a hooked nose, perhaps an attribute of Tzitzimime divinities. In fact, some scholars have identified the frame goddess with a hooked nose in Borgia 29 and the strip goddess from which Quetzalcoatl is born in Borgia 32 as Cihuacoatl (Figures 13c, 14a, and 14b), a deity whose iconographic traits and ambivalence match the Tzitzimime's appearance and nature (Anders et al. 1993a:177-180, 192-243;Jansen and Pérez Jiménez 2017:450-458;Klein 2000;Milbrath 1988:161-163;Nowotny 1977). Similarly, the skeletal entity that gives rise to multiple wind-related beings and ropes with descending spiders in Borgia 29 (Figure 14a) shares a cluster of attributes-stellar eye, fleshless mandible, face paint, series of flags in the background, not to mention a coiled-nose!-with a deity in plate 13 of the Codex Cospi, while both the appearance of these entities and their paraphernalia are reminiscent of the representation of a Tzitzimitl in the Codex Magliabechiano (Anders 1970:f. 76r)-although in this latter image, painted during the Colonial era, the coiled or hooked nose is not present.
Last but not least, our interpretation is reinforced by the pair of volutes-one dark green and the other bright blue-green-that stand for the torso of the small forehead figure, as well as the additional volute below its teeth ( Figure 10). As said, volutes could symbolize the wind's spiral gusts and were a distinctive feature of Wind Gods in Mesoamerica, as exemplified in the Gotha Bird Head, where we can see two volutes curled on top of the eyes to form the eyebrows and another one on top of the protuberance/nose to suggest the breath escaping from this appendage. In our view, the decision to render the descending figure's torso as volutes might have enhanced its characterization as a wind entity, while emphasizing this figure's connection to the Wind God manifestation represented in the Gotha sculpture. Additionally, depicting a volute near the descending figure's mouth might refer to the cosmogonical or destructive gusts blown by the Tzitzimitl Quetzalcoatl Ehecatl, a god that created the world by blowing and then ruined it with his winds (Dupey García 2018b). The diminutive figure on the Gotha sculpture as a reference to the Tzitzimitl nature of the Wind God-perhaps manifested at his birth-is reinforced by its location on the forehead, a functional locus especially appropriate for expressing key aspects of the god's self or identity.

Original Appearance and Function of the Object
The flat wooden bar with a central knob on the top of the Bird Head lacks any trace of decoration except for a few tesserae on its front edge, suggesting this was originally the only visible part of it (Figures 5 and 7d). This leads us to believe the bar might have supported some kind of decoration, possibly a headdress, while the two The Wind God and the Descent of the Tzitzimitl holes on the sides of the head might have been used to tie this additional decorative item to ensure its stability (Figures 5 and 9a). But what kind of decorative attachment might be expected on the Gotha sculpture? Based on the iconography of the Nahua and Mixtec Wind Gods, their typical troncoconical headdresses come to mind (Figures 12b-12d), although it is difficult to imagine how a threedimensional item could have stood on top of the narrow wooden bar. A perhaps more plausible idea is that the sculpture displayed a feathered head ornament. It could have had the shape and colors of Quetzalcoatl Ehecatl's fan-shaped ornament fashioned with dark and red feathers and spotted with stellar eyes, which sometimes was not fixed on the neck but on the upper back part of the god's head or, in other instances, was double and appeared on both the back and top of the head (Figure 12f; Anders et al. 1991:Plates 3, 26, 27, 1993c. If so, the juxtaposition of precious stones, shells, and feathers would have further enhanced the multimedia character of the sculpture through three categories of materials whose different qualities of brilliance were highly prized in Postclassic central Mexican aesthetics (Caplan 2014(Caplan , 2019Dupey García 2018a;Russo 2011).
Our hypothesis is supported by references to mosaic-encrusted items decorated with feathers in diverse colonial inventories and chronicles. The Annals of Cuauhtitlan, in particular, relate the myth of the decadence of Tollan, in which Coyotlinahual, the patron deity of feather workers, fashioned a polychrome mosaic mask for king Quetzalcoatl; it had serpent teeth and was associated with a head fan (apanecayotl) and a beard made of feathers (Bierhorst 1992:30-33;Bassett 2015:30). Similarly, the attire of Quetzalcoatl sent to Hernán Cortés by Moctezuma II included, according to the Florentine Codex, a turquoise-mosaic mask "inserted on a high and big crown full of rich feathers, long and very beautiful, so that on placing the crown on the head, the mask was placed over the face" (engerida en una corona alta y grande, llena de plumas ricas, largas y muy hermosa, de manera que poniéndose la corona sobre la cabeza se ponía la mascara en la cara; Sahagún 2000:vol. 3, p. 1167; English translation from Saville [1922:13-14]). A comparable association between a mosaic mask and a feathered item appears in the Tlaloc costume given on the same occasion, which included "a mask with its feather-work" (una máscara con su plumaje; Sahagún 2000Sahagún : vol. 3, p. 1168English translation from Saville [1922:15]). It is also worth citing the list of objects that Cortés shipped to Spain together with his famous second letter, in which "two colored feather adornments that were for two gemstones helmets" (dos plumajes de colores que son para dos capacetes de pedrería) are mentioned (Cortés 1985:25). This last description inevitably recalls the mosaic-encrusted horned helmet today in the British Museum, which has a hole on top where feathers could have been inserted (McEwan et al. 2006:53).
The list of gifts received by Cortés brings us to the problem of the Gotha sculpture's function. In our description and interpretation, we have carefully avoided the use of functionally charged terms, in particular "mask," which has been employed since Andree's (1888Andree's ( : 215, 1889Andree's ( :128-129, 1890 first remarks on the piece and often repeated in subsequent scholarly works (Oppel 1896:9;Pogue 1912Pogue : 449, 1915Schwarz 2013;Seler 1967Seler [1923:365). Toscano defined the Gotha artifact, as well as various other specimens covered with mosaic, as pectorals (Toscano 1984(Toscano [1944. Other scholars, more cautiously, avoided this kind of terminology, instead using neutral phrasings such as "bird's head" (Izeki 2008:139;Saville 1922:81). Bube (1846:68) proposed it could have been part of an "idol," an idea echoed by Pasztory (1983:277) for mosaic-encrusted objects in general. This author suggested this category of art pieces was worn by gods' embodiments, while Schwarz recalled that Nahua priests often wore the attributes of gods during their festivals and proposed the Gotha "mask" might have been part of one of these "costumes," even stating that its dimensions coincide with those of a human face (Schwarz 2013:31-32). The object's narrowness, however, reveals it could not have been worn on the face or directly on the head of a human being (Figures 6 and 8). Nevertheless, it is plausible that it could have been part of a bird-shaped headdress, like those seen in codex imagery. In Mixtec codices, these head decorations sometimes include almost complete representations of the Wind God's head, with his characteristic bill and protuberance, but without the lower mandible (Anders et al. 1992a:Plate 51, 1992b. It is also worth exploring an alternative hypothesis. Analyzing other mosaic-encrusted "masks" representing beings known as ñuhu, the senior author of this article had put forward the ideabased on codex imagery and archaeologically associated materials-that these pieces might have been attached to sacred bundles, to express the identity of the deities embodied within these ritual items (Domenici 2021a). Given the key role played by sacred bundles in Mesoamerican religious life (Bassett 2014(Bassett , 2015Correa Valdivia 2013;Guernsey and Reilly 2006;Hermann 2008;Olivier 1995Olivier , 2006Olivier , 2007Olivier , 2017Pohl 1994:23-41;Stenzel 1970;Winzenz 2008), they are often depicted in pre-Hispanic and colonial codices, where they sometimes display attached "masks," such as those of a ñuhu or the Mixtec Rain God Dzahui in the Codex Selden (Caso 1964:Plates 3, 5, 8, 14). Neither the jaguar-skin bundle of Quetzalcoatl described by Alva Ixtlilxóchitl (1985:vol. 1, p. 387), nor the various sacred bundles of the Wind God depicted in the Mixtec Codex Nuttall display any "mask." Instead, they are identified by associated calendric names, location in temples, or an anthropomorphic flint knife alluding to the deity's birth; a flint knife could also have been wrapped within the bundle (Hermann 2008:80-81;Jansen 1982:vol. 2, pp. 326-327;Olivier 2007:287;Pohl 1994:26, 32-33). Nevertheless, the head of the beaked Wind God surmounts two sacred bundles depicted in the Selden Roll, a colonial manuscript from the Coixtlahuaca Valley ( Figure 15; Burland 1955).
Even if these images of the Wind God's head perhaps do not represent masks-they could well be iconographic devices used in pictorial communication to express the "identity" of an otherwise unrecognizable bundle-the cases of the ñuhu and the Mixtec Rain God in which only the facial area and not the whole head is represented in Codex Selden, as well as some Maya and Teotihuacan representations of bundles (Taube 1986: 70-71) strongly suggest that actual masks found in archaeological contexts were at times attached to bundles. For example, the bowl containing a ñuhu mask in a niche of Zaachila Tomb 1 might have previously contained a bundle with a mask (Gallegos 1963). According to Mendieta (1993:79-80), Nahua god bundles were created after their sacrificial death during the creation of the Fifth Sun, thus blurring the conceptual distinction between sacred and funerary bundles, which in many cases-especially royal ones-were provided with masks. Indeed, in the Relación de Michoacán not only the face of the dead cazonci was covered with a mask, but a feathered turquoise mask was attached to the entire bundle containing his cremated ashes (Roskamp 2010:49). Another relevant case is that of captives sacrificed by the Mexica during the Tlacaxipehualiztli festival: according to Sahagún's (1953Sahagún's ( -1982) Indigenous collaborators, each captor hung his victim's femur to a pole "[a]nd he wrapped the thighbone in paper, and provided it with a mask (Auh in queztepolli, amatica qujqujqujmiloaia, qujxaiacatiaia)." In view of the various lines of evidence supporting the proposal that masks were fixed to sacred bundles, it is highly possible that the Gotha sculpture served a similar purpose, which is in fact as plausible as its use as part of the attire of a priest or a human embodiment of the Wind God. A similar hypothesis has been put forward for the Copenhagen mosaic-encrusted wood sculpture representing Xolotl, whose rear tube-like, hollow socket suggests it could have been attached to a baton inserted in a bundle, as illustrated by the bundle with a head of Xolotl on plate 64 of the Codex Vaticanus B (Domenici and Nielsen 2018:126). If tied to a bundle by means of its two lateral holes, the Gotha sculpture would have hung in an almost vertical position, perfectly displaying the fierce descent of the small figure on its forehead.

Provenance
As mentioned at the beginning of this article the earliest reference to the Bird Head sculpture is in the now-lost 1830 inventory of the ducal family of Gotha's collections, in which its Roman origin was recorded. Since the artifact was not cited in the previous 1796 inventory, we can assume that the object arrived in Gotha between 1796 and 1830. This time span could be further refined thanks to the 1840 reference to Mr. Buttstädt, the valet of Friedrich IV of Saxe-Gotha-Altenburg, thus linking the arrival of the sculpture to Gotha to this prominent figure tied to the ducal family. Eberle (2010:38-39) stated that the object arrived "around 1824," a proposal that, in the absence of any documentary evidence, must be considered as a simple guess. Schwarz (2013:30), on the other hand, rightly noted that the object could have reached Gotha earlier than 1824, because Friedrich spent long periods in Rome between 1804 and 1820 (specifically 1804-1805, 1807-1810, and 1814-1820Beck 1868:1-451). Nevertheless, Friedrich's acquisition of the Mexican mosaic-encrusted piece increased the American section of the family collection, which already included various North American items previously acquired by his father Ernst I of Saxe-Gotha-Altenburg.
From whom Duke Friedrich or his valet, Mr. Buttstädt, acquired the Bird Head in Rome is unfortunately a matter of speculation. Andree (1889:129) stated it "comes from the collections of the local Jesuits," but it is not clear if this proposal of a Jesuit provenance is based on unpublished information or if it is mere conjecture adhering to the almost formulaic attribution of every Indigenous American object in Italy to the Jesuits. Exploring other possibilities, Schwarz (2013:30-32) cautiously advanced the hypothesis of a gift received from Pope Pius VII in recognition of Friedrich's conversion to Catholicism, at the same time that he recognized that other sources, such as the Kircherian or other missionary collections, should be taken into consideration. Building on these proposals as well as on the results of recent research focusing on the arrival of Mesoamerican artifacts to Italy (Domenici 2017a(Domenici , 2017b(Domenici , 2020Domenici and Laurencich Minelli 2014), we would like to offer an alternative hypothesis regarding the provenance of the Gotha sculpture.
In 1811, Friedrich of Saxe-Gotha-Altenburg bought 12 paintings from the Giustiniani family, who had owned them since the early seventeenth century as part of one of the most consequential art collections in Rome (Danesi Squarzina 2003:vol. 2, p. 339). In fact, Friedrich's stays in Rome coincided with a period of extreme economic difficulties for the Giustiniani family, which led to the sale of significative parts of the collection, especially by Vincenzo Giustiniani "junior" (1759-1826). The attempts to overcome the restrictions of the fidecommissum that impeded any sale of the family heritage date back to the mid-seventeenth century and various sales are recorded since the beginning of the eighteenth century. The peak of the dispersal of the Giustiniani collection occurred in the first two decades of the nineteenth century, when the new "French" laws introduced after Napoléon Bonaparte's campaigns in Italy-together with the deepening economic crisis stemming from the new fiscal system that strongly penalized noble families (Domenici 2021c)-triggered the sales of artworks. Various paintings were marketed in Rome and Paris between 1803 and 1812 (with buyers such as Lucien Bonaparte and Russian tsar Alexander I), as part of a process that culminated in the sale of the most valuable bulk of the collection (155 artworks) to Friedrich Wilhelm III, King of Prussia, between 1812 and 1815 (Aldenhoven 1890;Danesi Squarzina 2003:vol. 1, pp. xix-xxii;Salerno 1960:26;Vodret 2001;Vogtherr 2001). It was in this context that Friedrich of Saxe-Gotha-Altenburg bought the 12 paintings from the Giustiniani collection in 1811, probably thanks to agreements reached when he was in Rome a few months earlier (Danesi Squarzina 2003:vol. 1, pp. 170, 304-305, vol. 2, pp. 82, 300, 339).
The acquisition of artworks from the Giustiniani family by then Prince Friedrich is extremely interesting in light of the fact that, since the beginning of the seventeenth century, the Giustiniani collection included a Mesoamerican codex (which the senior author has identified as the Codex Borgia) and more than 30 mosaic-encrusted objects (Domenici 2018:354-356;Domenici and Laurencich Minelli 2014:192-196). This significant Mesoamerican collection can be traced reasonably to the Dominican friar Domingo de Betanzos, who travelled from Mexico to Italy in 1532-1533 to meet Pope Clement VII, bringing a lavish gift of Indigenous items including painted manuscripts and mosaic-encrusted artifacts. The link between Betanzos and the Giustiniani family could have been Cardinal Vincenzo Giustiniani (1519-1582), General of the Dominican Order (1558-1580) at the Santa Maria sopra Minerva convent in Rome, the same convent where Betanzos had resided a few decades earlier (Domenici and Laurencich Minelli 2014:195). In sum, the presence of numerous Mesoamerican mosaic-encrusted objects in the Giustiniani collection, its dispersal during the nineteenth century, and Friedrich's acquisition of paintings from the same collection strongly suggest the Bird Head sculpture now in Gotha could have been acquired from the Giustiniani family, who might have owned it as a consequence of Domingo de Betanzos residence in Rome in 1532-1533. Despite the lack of conclusive documentary evidence to support it, this hypothesis seems reasonable and more solid than those previously advanced, in particular because the relationship between the Bird Head and a group of Mesoamerican objects possibly brought to Italy by Domingo de Betanzos is further supported by their formal similarities within the broadest corpus of mosaic-encrusted artifacts (Domenici 2020).
Our description of the Gotha sculpture has shown that one of its most distinctive features is its dramatic polychromy, which was due to the use of a wide range of materials of different colors, including various shades of turquoise and/or cultural turquoise, malachite, Spondylus, white shell, mother-of-pearl, and perhaps lignite. The combination of these different materials made the Bird Head a "multimedia" object, a feature that might have been emphasized by the attachment of feathers. Furthermore, the polychromy of the mosaic is heightened by stylistic traits such as the frequent juxtaposition of different color areas, particularly the multicolor series of bands (Dupey García 2021). The polychromy and the use of a wide range of materials occur in conjunction with specific designs such as the stellar eye, the black-and-white motif, and the series of disks, along with technical strategies such as the grooves incised on white shell tesserae and filled in with the brown adhesive to create iconographic details such as the pupils of eyes. This set of attributes, far from being shared by all Nahua and Mixtec mosaic-encrusted artifacts, constitute a polythetic group of traits defining a specific subgroup of extant Mesoamerican mosaics.
Although a thorough definition of this subgroup has been the subject of another work by the senior author (Domenici 2020), it is worth mentioning that among its most relevant members are the Yacatecuhtli mask and the two knife handles in the Pigorini Museum (Rome), two artifacts in the National Museum of Denmark (Copenhagen), and the two knife handles and the "horned headdress" in the British Museum (London). Interestingly, most of these mosaic-encrusted pieces share an Italian provenance. Indeed, the three objects in the Pigorini Museum were formerly held in Bologna for centuries as part of the Aldrovandi and Cospi collections, and their ultimate origin was most probably linked to Domingo de Betanzos's voyage to Bologna in March 1533 (Domenici 2020;Domenici and Laurencich Minelli 2014). The two artifacts now in Copenhagen were originally held in Rome and, according to the 1856 inventory of the Copenhagen Cabinet of American Antiquities, "they probably were brought by a missionary from Mexico." They were sold to the Danish museum on April 9, 1856, by the antique dealer William Chaffers at an auction in London, in a private, off-the-record way (Domenici and Nielsen 2018:122-123). The knife handle in the British Museum was bought by Bram Hertz from the antique dealer Samuel Luke Pratt and, as stated by Hertz himself in a letter to Henry Christy on February 2, 1859, it came from Florence or Venice (Hertz contradicts himself in the letter). The knife was then bought by Henry Christy on February 7, 1859, at the London auction in which Hertz's collection was sold (Caygill 2012:184-187; Domenici 2021c). The "horned headdress" today in the British Museum is the singular object of this multimedia, polychrome subgroup of mosaics that has no explicit connection to Italy: it was bought on April 14, 1893 by Augustus Wollaston Franks, curator of the British Museum collections, at the auction where the collection of Thomas Bateman was sold in London. It is interesting, though, that Bateman acquired the headdress from the antique dealer William Chaffers, who had bought it in Paris in 1854 (Caygill 2012:195). Chaffers was the dealer who sold the two "Roman" mosaics to the Copenhagen Cabinet of Antiquities, which suggests the headdress could have had a similar Italian origin. Its sale in Paris would not be surprising, since both the French capital and London were nineteenth-century hubs of the European antiquities market; part of the Giustiniani collection, for example, was sold in Paris at the beginning of the century.
The data collected here strongly suggest that most, if not all, the members of a specific group of multimedia, polychrome mosaic-encrusted artifacts held in early European collections were once in Italy, in the cities of Bologna, Rome, and maybe Florence, in other words, the three cities that shared connections with Betanzos's trip through the Italian peninsula (Domenici 2020(Domenici , 2021d. Indeed, the Dominican friar travelled to Rome and Bologna, where he gifted Mesoamerican objects, including mosaics, to Pope Clement VII, a member of the powerful Florentine Medici family (Domenici and Laurencich Minelli 2014). Even though the specific details of its arrival in Italy is probably doomed to remain the subject of tentative hypotheses, the mere presence of this lot of polychrome mosaics in Italy suggests they arrived together and, perhaps also, that they came from the same ultimate region of origin (Domenici 2020). A precise identification of such a region within the Nahua-Mixteca cultural sphere is challenging, but it is worth recalling that the 3-Dog day sign on the front of the Xolotl sculpture in Copenhagen, depicted as a disembodied dog's ear, links it to the Codex Fejérváry-Mayer (Domenici and Nielsen 2018:128-129), while the hooked-nose figure on the forehead of the Gotha Wind God sculpture connects it to the codices Borgia and Cospi. This proximity to manuscripts belonging to the Borgia Group suggests that the Valley of Puebla-Tlaxcala or more broadly the central-southern area of the modern state of Puebla could be reasonable areas of ultimate origin for the corpus of multimedia, polychrome mosaics, including the Gotha Bird Head; a proposal also coherent with the role of Domingo de Betanzos in the arrival of these artworks in Italy, since this Mesoamerican region was within the Dominican sphere of activity in early colonial times.