Courtesy Thomas Ammann Fine Art AG

Saint Louis Art Museum, Bequest of Morton D. May 850:1983

Saint Louis Art Museum, Bequest of Morton D. May 851:1983

Städel Museum, Frankfurt am Main - U. Edelmann / ARTOTHEK

Photograph Courtesy of Sotheby's, Inc. © 2017

Archiv Eigentümer(in) / Owner's archive

Seattle Art Museum, 55.74, Gift of Sidney and Anne Gerber