Marlene Dumas (South African/British, born 1953) Alan Turing Piezographic print, 2015, on wove, signed, dated and numbered 39/100 in pencil, printed by Bernard Ruijgrok Piezografie, Amsterdam, published by Tate, London, with the printer's blindstamp, with full margins, 440 x 350mm (17 3/8 x 13 3/4in)(SH)