Snap, crackle and op

Stand in front of ‘Fall’, a painting by Bridget Riley from 1963, and the world begins to quiver and dissolve. Something you normally expect to be static and stable — a panel covered with painted lines — undulates and pulses. In addition to just black and white, the pigments actually present, other hues appear and disappear: faintly luminous pinks and greens.

To her irritation, the artist was once told, ‘as though it were some sort of compliment’, that ‘it was the greatest kick’ to smoke dope while looking at this painting. The remark, much though it affronted Riley, is wonderfully characteristic of its epoch, the mid-1960s. We usually think of op art itself as dating from the era of Mary Quant, the Beatles and LSD.

Seurat to Riley: The Art of Perception, a jolly and entertaining exhibition at Compton Verney, Warwickshire, takes issue with that view. Op, it argues, has a much longer history.