License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Giovanni Battista Galliani. Design for a Stage Set: Design in Section of a Two-Storied Entrance Hall (Recto). Elevation Design for a Monumental Entrance with Columns and Rounded Pediment (Verso)., 1794. The Metropolitan Museum of Art.