Kitab Suwar al-Kawakib (The Book of the Forms of the Stars) of ʿAbd al-Rahman b. ʿUmar al-Sufi (d. 986), though based largely on Ptolemy's Almagest, included much original material. In the 20th century, its importance for scholars lay mainly in its attestation of the ways Islamicate scholarship built on classical learning. Now we are finding that it also offers fascinating insights into the complex relationship between seeing and knowing in premodern Islamic book culture. Here, I consider that relationship through analysis of the paired images of the constellation Barshawush (Perseus) from the oldest surviving manuscript, copied and likely also illustrated in 1009–1010 by al-Sufi's son.