Photo, january 14th 1961 Yves Klein surrounded by Sponge Sculptures during the exhibition "Monochrome und Feuer", Museum Haus Lange
Photo, 1961 Yves Klein surrounded by his works at the exhibition "Yves Klein Monochrome und Feuer" at the Museum Haus Lange
Photo, 1959 Yves Klein, Iris Clert and Rotraut at the opening of the exhibition "Bas-reliefs in a sponge forest", Galerie Iris Clert