A relaxed face (left); Profound attention (right), plate 9 from the album, The Mechanism of Human Facial Expression. Dated: 1854-1856. Dimensions: image: 22.3 ? 16.2 cm (8 3/4 ? 6 3/8 in.) mount: 40.3 ? 27.4 cm (15 7/8 ? 10 13/16 in.). Medium: albume