Photo, 1949 Christmas evening at Hans Hartung's with Yves Klein standing on the right, surrounded by Colette and Pierre Soulages
Photo, 1961 Pierre Restany during the exhibition "Yves Klein the Monochrome: il nuovo realismo del colore", Galleria Apollinaire
Photo, january 1957 Yves Klein during the exhibition "Proposte monocrome, epoca blu", Galleria Apollinaire