License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giorgio Ghisi. Apollo, Pan, and a Putto Blowing a Horn, a cruciform composition, from a series of eight compositions after Francesco Primaticcio's designs for the ceiling of the Gallery of Ulysses (destroyed 1738-39) at Fontainebleau, 1560s. The Metropolitan Museum of Art.