2007 Christie's Images Limited

San Francisco Museum of Modern Art, Gift of Louise S. Ackerman. Foto: Katherine Du Tiel

Museum Ostwall im Dortmunder U. Foto: Jürgen Spiler, Dortmund

Collection Walker Art Center, Minneapolis. Gift of Mr. and Mrs. John Cowles, Sr. 1964

Ludwigshafen, Wilhelm-Hack-Museum

Courtesy Thomas Ammann Fine Art AG

Ahlen, Kaldewei Kulturstiftung. Foto: Fotostudio Bartsch, Berlin

© Staatsgalerie Stuttgart

akg-images 255323

Museum Folkwang Essen / ARTOTHEK

Fort Dodge, Blanden Art Museum

Collection Albright-Knox Art Gallery, Buffalo, New York. Room of Contemporary Art Fund, 1950 (RCA1950:1). Foto: Tom Loonan