License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Gregorio de' Ferrari. Ornamental Design for a Wall Monument Surmounted by a Balustrade with Human Figures, Angels Holding Garlands and Draperies (recto and verso), 1647–1726. The Metropolitan Museum of Art.