License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Bartolomeo Crivellari. Plate 7: the blinded Polyphemus, guarding the entrance of his cavern, with Ulysses and his companions escaping below by covering themselves with ram skins, 1756. The Metropolitan Museum of Art.