"Guillaume-Benjamin-Amant Duchenne (de Boulogne), Attention (left); Severity, aggression (right), 1854-1856, albumen print, printed 1862, image: 22.1 × 15.8 cm (8 11/16 × 6 1/4 in.) mount: 40.2 × 27.5 cm (15 13/16 × 10 13/16 in.), W. Bruce and Delaney H. Lundberg Fund, in Honor of the 25th Anniversary of Photography at the National Gallery of Art, 2015.52.5"
