License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Jacques Callot. Le Rossignol Posé sur un Buisson (A Nightengale Standing on a Bush), plate 14 from "Lux Claustri ou La Lumière du Cloitre" (The Light of the Cloisters), 1621–35. The Metropolitan Museum of Art.