Michal Smajewski, known as Michel SIMA Jean Arp with his works, c. 1950 Constellations de formes blanches sur fond gris (1941) - Constellation: Fleurs-nuages (1932) - Cohérent et érigé (1942) - Coquille-nuage II (1949) - Evocation d'une forme: humaine, lunaire, spectrale (1950) Two vintage silver prints Signed and annotated in pencil by his son Pierre Sima Michel Sima" stamp on versos 12.80 x 23 cm and 24.50 x 24 cm Provenance: Michel Sima family collection Two vintage gelatin silver prints ; signed and annotated in pencil by his son Pierre Sima ; stamp on versos 5 1/16 × 9 1/16 in. - 9 5/8 × 9 7/16 in. Michal Smajewski, known as Michel SIMA