Fig. 1. Prometheus Bound. Oil on canvas. Begun c. 1611–1612, completed by 1618. Peter Paul Rubens (Flemish [active Italy, Antwerp, and England], 1577–1640), and Frans Snyders (Flemish [active Antwerp], 1579–1657). Philadelphia Museum of Art: Purchased with the W. P. Wilstach Fund, 1950, W1950-3-1. Photo by Alberto Otero Herranz, courtesy of the Prado Museum, 2015. Reproduced by permission.