Photo, ca. 1960 Yves Klein and Rotraut with Ci-gît l'Espace [Here Lies Space] (RP 3) and the Sponge Relief (RE 20)
Photo, january 1961 Yves Klein with the work Ci-gît l'Espace [Here Lies Space] (RP 3) during the exhibition “Monochrome und Feuer”, Museum Haus Lange
Photo, 1957 Yves Klein in front of his Sponge Sculpture at the exhibition "Monochrome Propositions of Yves Klein" Gallery One, London
Film, 1959 Yves Klein's exhibition : Bas-reliefs dans une forêt d'éponges [Bas-reliefs in a forest of sponges], galerie Iris Clert, Paris, France
Photo, 1959 Yves Klein, Iris Clert and Rotraut at the opening of the exhibition "Bas-reliefs in a sponge forest", Galerie Iris Clert