Von der Heydt-Museum Wuppertal. Foto: Antje Zeis-Loi, Medienzentrum Wuppertal
Nationalgalerie, SMB / Jörg P. Anders
Courtesy Villa Grisebach, Berlin
Collection Walker Art Center, Minneapolis. Gift of Mr. and Mrs. John Cowles, Sr. 1964
Courtesy Thomas Ammann Fine Art AG
Courtesy Thomas Ammann Fine Art AG