A relaxed face (left); False joy or laughter (right), plate 30 from the album, The Mechanism of Human Facial Expression. Dated: 1854-1856. Dimensions: image: 22.7 ? 16.8 cm (8 15/16 ? 6 5/8 in.) mount: 42 ? 27.4 cm (16 9/16 ? 10 13/16 in.). Medium: a