Otto Piene (1928-2014) Untitled (Rasterbild), 1959 Oil on canvas Signed and dated on the back 66 × 94 cm Provenance : - Galerie M. E. Thelen, Essen - Acquired from the latter in 1971 - Private collection - Sale Amsterdam, Christie's, 'Post-War and Contemporary', 15 April 2015, lot 2- Acquired from the latter by the current owner - Private European collection Bibliography: S. von Wiese, 'Otto Piene: Retrospektive 1952-1966: Raster, Rauch, Feuer, Licht, Sky Art, Inflatables, CAVS, neue Arbeiten', Köln, Wienand, 1996, reproduced p. 66