Sophie Taeuber-Arp, Elementary Forms in a Vertical-Horizontal Composition (Formes élémentaires en composition verticale-horizontale), 1917, gouache, 11 7⁄16 x 9 7⁄16 in. (29 x 24 cm). Stiftung Hans Arp und Sophie Taeuber-Arp e.V., Rolandswerth, inv. 003.550 (artwork in the public domain; photograph provided by Stiftung Hans Arp und Sophie Taeuber-Arp)
