Attention, attentive gaze (left); Painful attention (right), between 1854 and 1856

Date: between 1854 and 1856. Dimensions: image: 22.8 × 16.6 cm (9 × 6 9/16 in.); ; mount: 40.3 × 27.6 cm (15 7/8 × 10 7/8 in.). Medium: albumen print. Collection: National Gallery of Art.