A Perspective of a Faceted Snail Shell Balanced on a Pyramid. Dated: 1567. Dimensions: plate: 23.6 ? 25.2 cm (9 5/16 ? 9 15/16 in.) sheet: 26.7 ? 28.4 cm (10 1/2 ? 11 3/16 in.). Medium: etching on laid paper. Museum: National Gallery of Art, Washingt