License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous, French, 16th century. St Peter's, entablature profile; reflected ceiling details of the cornice, and profiles of column bases and pedestals (recto)
St. Peter's, section through drum of model and entablature of upper story (verso), early to mid-16th century. The Metropolitan Museum of Art.