Photo, 1961 Yves Klein and Paul Wember at the opening of the exhibition "Yves Klein Monochrome und Feuer" at the Museum Haus Lange
Photo, 1959 International collaboration between artists and architects in the realisation of the new Gelsenkirchen Opera House
Document, 1961 Invitation card for the exhibition "Yves Klein Monochrome und Feuer" at the Museum Haus Lange in Krefeld