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Transparent and blue Plexiglas module signed Henri Gabriel and dated 1954 (1 missing, + 3 plates to be reattached). 65x65 cm. Enclosed is a brochure entitled "Henri Gabriel, Optique et cinétique" published by Quadri Gallery in 1991. Texts by Emiel Bergen, Jean Coquelet, Jo Delahaut, Henri Gabriel, Frank Popper