License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Bernard Picart. Portrait of Andrea Palladio in half-length within an oval frame; a compass, carpenter's square, and plumb line rest on the plinth below the oval, from an unidentified edition of "Architecture de Palladio", revised by Giacomo Leoni and translated by Nicholas du Bois, 1716. The Metropolitan Museum of Art.