Pierre Cordier (1933) Chimigramme, 1961. Silver print, signed, titled and dated in ink on verso. 36 x 50.5 cm - framed Provenance : Galerie Thessa Herold, Paris. Exhibition: Un monde non-objectif en photographie II, Paris, Galerie Thessa Herold, 2006. Bibliography: Authors, Tome 3, Madrid, Éditions del Umbral, 2015, p. 797. A process of direct exposure of the photographic sheet (i.e., without a camera), the chemigram is obtained by playing with the action of developers, fixers or other substances (varnish, oil, paint, etc.) capable of modulating the interaction of light with the photosensitive emulsion.