L'Optique (The Optical Viewer). Dated: c. 1793. Dimensions: plate: 55 x 45 cm (21 5/8 x 17 11/16 in.) sheet: 55.9 x 47.8 cm (22 x 18 13/16 in.). Medium: etching and wash manner, inked la poup e in black, brown, and green with hand coloring. Museum: N