San Francisco Museum of Modern Art, Gift of Louise S. Ackerman. Foto: Katherine Du Tiel
Collection Walker Art Center, Minneapolis. Gift of Mr. and Mrs. John Cowles, Sr. 1964
Courtesy Thomas Ammann Fine Art AG
Ahlen, Kaldewei Kulturstiftung. Foto: Fotostudio Bartsch, Berlin
akg-images 255323
Museum Folkwang Essen / ARTOTHEK