Düren, Leopold Hoesch Museum. Foto: Aachen, Peter Hinschläger

Photograph Courtesy of Sotheby's, Inc. © 2002

Courtesy Thomas Ammann Fine Art AG

Leipzig, Museum der bildenden Künste

akg-images 442531

Courtesy Hauser & Wirth Collection Services

Saint Louis Art Museum, Bequest of Morton D. May 867:1983