Jean Arp (Hans Arp), French, born Germany (Alsace), 1886-1966. Untitled (Forest) c. 1917. Painted wood relief, 32.7 x 19.7 x 7.6 cm. National Gallery of Art, Washington, Andrew W. Mellon Fund © 2006 Board of Trustees, National Gallery of Art, Washington, photo: Lorene Emerson © 2006. Hans Arp/Artists Rights Society (ARS), New York/VG Bild-Kunst, Bonn.