Stampfle, Felice. Giovanni Battista Piranesi, Drawings in the Pierpont Morgan Library. New York : Dover, 1978, no. 62, repr.
Drawing is on verso of a fragment of an etching from "Antichit ̉d'Albano e di Castel Gandolfo," 1764, f. 523.
The design is less overtly didactic and includes medallions, a caduceus, and--as indicated by Piranesi's inscription in the corner--a fiacola, or torch. The figure is unrelated to the fireplace design; it is one of Piranesi's many quick sketches of people seen in the studio, like the figure drawings elsewhere in the exhibition.