Bridget Riley, 2 Colour Twist — Blue⁄Red and Violet⁄Yellow, Series 41 — Green Added, 1979.
Courtesy of the artist
36. 2 Colour Twist — Blue/Red and Violet/Yellow, Series 41 — Green Added
| Artist | Bridget Riley |
| Year | 1979 |
| Medium | Pencil and gouache on paper |
| Dimensions | 381⁄4 x 197⁄8 in. (97 x 50.5 cm) |
| Collection | Courtesy of the artist |