License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Callot. Les Deux Coeurs (The Two Hearts), plate 24 from "Lux Claustri ou La Lumière du Cloitre" (The Light of the Cloisters), 1621–35. The Metropolitan Museum of Art.