Photo, janvier 1961 Yves Klein next to a Sponge Relief (RE 10) lors de son exposition "Yves Klein Monochrome und Feuer", Museum Haus Lange
Photo, ca. 1960 Yves Klein and Rotraut with Ci-gît l'Espace [Here Lies Space] (RP 3) and the Sponge Relief (RE 20)
Photo, 1959 Yves Klein before the inauguration of his exhibition "Vision in Motion - Motion in Vision", Hessenhuis, Antwerp
Photo, 1959 International collaboration between artists and architects in the realisation of the new Gelsenkirchen Opera House