Figure 21. Example of an unfinished painting: Attributed to Bihzad, Assault on a Castle, ca. 1475–1500. Opaque watercolor and gold on paper; image with border: 33.5 x 22.5 cm (13 3/16 x 8 7/8 in.), Harvard Art Museums/Arthur M. Sackler Museum, Bequest of Abby Aldrich Rockefeller, 1960.199. Photo: Imaging Department, copyright: President and Fellows of Harvard College.