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13 - An Illustration of the Invention Process and Its Implications for Societal Information Processing

from Part II

Published online by Cambridge University Press:  13 December 2019

Sander van der Leeuw
Affiliation:
Arizona State University

Summary

In this chapter, the approach proposed in Chapter 12 is exemplified by looking at invention in pottery making, based on the author’s early work on ceramic technology. In the first part, the context and nature of the perspective of the potter, and its articulation with the material world are outlined in general terms, and in the second part an example is given of how this plays out for two different traditions of pottery manufacture, in the Philippines and Mexico.

Information

Figure 0

Figure 13.1 The wider context of pottery-making includes the physical, geographic, technological, social, and economic environment in which the potter works. Under each rubric only some of the actual variables are presented to give an idea of what each category stands for. These variables will differ from case to case.

(Source: van der Leeuw)
Figure 1

Figure 13.2 Once the potter starts gathering the raw materials, she will have a number of variables from the different categories in this figure in mind. If she intends to make cooking pots, for example, the wall of the pot has to be porous because heat gets transmitted into the pot through the water that penetrates the wall. Hence the potter looks for clay with relatively large nonplastic particles in it, or if that is not available she will add such particles. But in deciding which materials to use, she will also take effort into account (depth of clay, distance, effort involved in mixing).

(Source: van der Leeuw)
Figure 2

Figure 13.3 Paste preparation is a question of dosage and mixing of the plastic and nonplastic ingredients and water. The characteristics of each of these three are taken into account in determining the proportions of each to mix. More water makes the paste easier to shape, but if there is too much the paste will lose coherence. The exact dose of water depends to a large extent on the proportions and the nature of the clay and the nonplastic materials chosen, which in turn depend on the function of the pottery, as we see in Figure 13.2.

(Source: van der Leeuw)
Figure 3

Figure 13.4 Conceiving the shape and other qualities of the pottery to be produced integrates the topology, partonomy, and sequentiality of her conception of pottery, her assessment of her capabilities in handling the technique chosen, the function(s) of the pottery to be produced, the nature and quality of the tools at her disposal, as well as the nature of the paste to be used (see Figure 13.3). But it also relates to the quantity to be produced, and thus to the size of the market, the capabilities of the workshop, etc. For mass production, for example, molding or throwing are more efficient than coil building.

(Source: van der Leeuw)
Figure 4

Figure 13.5 Once the potter has conceived the vessel, the same factors will play a role in the shaping of the object. In reality, that shaping occurs in two or three phases, (1) shaping, (2) drying, and (3) firing. Much of the shaping will now be a question not of the conscious memory of the potter, but of her know-how, the musculo-skeletal memory and the memory of the nervous system, here summarized under “manufacturing routines developed.” The second phase, drying, is one in which only the atmosphere of the pot and the time allotted to drying are controlled. It may be interrupted by some minor modifications in the shape of the pottery or by decoration, but it does not require any major handling. In the third phase, firing, the paste and fuel categories play an important role, but they are integrated in the process of conceiving of the pottery. The categories “fuel qualities” and “paste qualities” have been added to this figure for reasons of space, although they should be seen as part of the last one.

(Source: van der Leeuw)
Figure 5

Figure 13.6 The workshop organization determines the overall production capacity, but is itself composed of such elements as the degree of specialization of the functions to be fulfilled, and thus the number of people involved in the workshop. That in turn relates to the family structure and the question whether outside help is hired or not. But it also relates to the competency of the members of the workshop, its spatial organization, and the time involved in firing, for example, which is again related to the means of firing chosen and the length of firing time needed for the products made. Ultimately, of course, the workshop’s capacity greatly impacts on the quantity of pottery produced, and thus on the economics of pottery manufacture in the place of production.

(Source: van der Leeuw)
Figure 6

Figure 13.7 Throughout the manufacturing process, in all the phases in which the potter conceives the pottery and makes her choices about how to instantiate it, the marketing of the pottery and the organization of the workshop (Figure 13.6) are domains that are systematically taken into account, as together they determine the quantity and quality of the products to be made.

(Source: van der Leeuw)
Figure 7

Photo 13.8 A female potter in Tanjay, Negros Oriental, Philippines makes a vessel by rotating a lump of clay on a small turntable. She began by opening the ball and shaping the rim, while leaving the remainder of the pot unshaped (see the two vessels she is not working on). Next, she is thinning out the wall between one hand supporting it on the outside and the other shaping it on the inside. After some drying, she will shape the bottom of the vessels with a hammer-and-anvil technique, then let the vessel dry and fire it.

Figure 8

Photo 13.9 Another female potter in Zamboanguita, Negros Oriental, Philippines is shaping a coil of clay on an inverted, fired pot covered by a piece of coarse fabric that serves as a mold. This coil will be shaped into the rim and upper shoulder of the vessel. The fabric serves to ensure that the wet clay does not stick to the inverted pot. Behind her stand some finished pots, and lies a paddle with which the vessels are given their final shape.

Figure 9

Photo 13.10a The same potter now shapes the base of a vessel over the inverted pot. After some drying, it will be united with one of the pre-shaped rims that lie in front of her, drying in the sun.

Figure 10

Photo 13.10b Once the two pieces have been joined, as in this photo, and have had some time to dry a little, the potter gives the vessels their final form by thinning their wall between a paddle (as seen in photo 13.9) and a rounded stone or piece of wood that serves as an anvil. Once that is done the vessel can be dried and fired.

Figure 11

Photo 13.11a An (exceptionally male) potter in San Carlos City, Negros Oriental, Philippines shapes a vessel on a turntable by opening a lump of clay, then shaping the rim and continuing by thinning the rest of the lump somewhat between his hands.

Figure 12

Photo 13.11b The potter then takes the vessel off the turntable, and places it in a fabric-covered basket so that he can start working on the base of the vessel. Ultimately, the vessel wall is thinned and the vessel given its globular shape between a paddle and an anvil.

Figure 13

Photo 13.12 Another female potter, in Dumaguete, Negros Oriental, Philippines is shaping large vessels in two halves, by placing coils on a fired, upturned vessel that is fixed on a stick. The stick is placed in a hollow upright bamboo, so that the whole contraption can turn more freely than the turntables in the earlier photos. Three coils are shaped into the base of the vessel, and then another three coils are shaped over the same mold into its shoulder and rim (as on the photo). Finally, after some drying, the two halves are joined and left to dry until the pot can be fired.

Figure 14

Photo 13.13 In Michoacán, Mexico, vessels are shaped in molds. Here, a closed vessel (with its opening narrower than its belly) is shaped by placing a pancake of clay in one half mold, then doing the same in the accompanying half. Both halves are then joined from the inside of the vessel. The vessel is left to dry, and after a while one half mold can be taken off (as here in the photo). A little later the other half can be takes off, the pot placed upside down on its rim, and the outside of the joint removed with a knife. The pot is then dried until ready for firing.

Figure 15

Photo 13.14 In Michoacán, Mexico, open vessels (bowls, plates, etc.) are shaped horizontally by placing a pancake of clay over a mushroom-shaped mold made by attaching a handle to an upside-down, fired, bowl. The potter shapes the vessel by hand against the mold, then shapes the rim by removing excess clay with a wire held between the teeth and one hand while rotating the mold. The photo shows two molds for open vessels above the resultant vessels, and one closed vessel in a vertical half-mold.

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