signed 'VASARELY' lower edge; further signed, titled and dated 'VASARELY "TSENGUE" CONÇUE EN 1960 ACHEVÉE EN 1987' on the reverse acrylic on board 50.8 x 32.8 cm (20 x 12 7/8 in.) Conceived in 1960 and executed in 1987, this work is accompanied by a certificate of authenticity from Pierre Vasarely.