Photo, 1957 Yves Klein in front of his Sponge Sculpture at the exhibition "Monochrome Propositions of Yves Klein" Gallery One, London
Exhibition, 14 May 1957 - 23 May 1957 Yves Klein : Propositions monochromes Galerie Colette Allendy, Paris, France
Document, 1957-1959 Yves Klein, "Règles rituelles de la cession des zones de sensibilité picturale immatérielle"