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Von der Heydt-Museum Wuppertal. Foto: Antje Zeis-Loi, Medienzentrum Wuppertal
Courtesy Thomas Ammann Fine Art AG
Seattle Art Museum, 55.74, Gift of Sidney and Anne Gerber
Washington D. C., Smithsonian Institution, Hirshorn Museum and Sculpture Garden. Gift of the Joseph H. Hirshhorn Foundation, 1966. Foto: Lee Stalsworth