Saint Louis Art Museum, Bequest of Morton D. May 843:1983

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

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Archiv Eigentümer(in) / Owner’s Archive. Foto: Peter Schälchli, Zürich