License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Anonymous, Italian, Piedmontese, 18th century. Design for an Obelisk; Partial Design in Elevation for Colonnade in the Doric or Tuscan Order (recto); Design for Fluted Column on Podium in Elevation (verso), 18th century. The Metropolitan Museum of Art.