Bridget Riley has produced some of the most ... which came to be defined as op-art (optical art), a visual symbol of the 1960s. But Riley has always rejected the op-art label.

Op Art, also known as optical art ... over the images and this creates feelings that the work itself is moving. Bridget Riley's Uneasy Centre features black and white circles painted with lines ...

Red, Green, and Blue Twisted Curves, 1979. The “spectator who looks at my work is part of the work itself,” Riley has said. Collection of the artist. ©Bridget ...

Op Art, also known as optical art ... Image caption, Uneasy Centre, Bridget Riley, 1963, screenprint, Peter Horree / Alamy Stock Photo Bridget Riley's Uneasy Centre features black and white ...