Bridget Riley (British, born 1931) Elapse (Schubert 30) Screenprint in colours, 1982, on wove, signed, titled and dated in pencil, from the edition of 260, printed by Graham Henderson, London, published by the Print Club, Cleveland, with their blindstamp, with full margins, 1021 x 639mm (40 1/8 x 25 1/8in)(I)