29 
of 30
29 
of 30
Bridget Riley
Coloured Greys [3]  1972
Colour screenprint
57.1 × 58.9 cm  |  22 1/2 × 23 1/4 in (image)
69.8 × 73.3 cm  |  27 1/2 × 28 7/8 in (sheet)
Edition of 125 plus 10APs