License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giuseppe Galli Bibiena. Designs for Stage Set: Three Pavillions in Background with "Oriental" (Ogival) Cupolas with Two Small Fountains between Them; in Foreground, a large Fountain with Dolphins Surmounted by Neptune, 1696–1756. The Metropolitan Museum of Art.