Bridget Riley retrospective mesmerises and excites at Hayward Gallery

I still remember the first time I saw Bridget Riley’s vivid, abstract paintings. It was at a provincial gallery, Wolverhampton or somewhere similar, in the mid-1970s. Coloured stripes and shapes shimmered and bounced, their contrasting yet consonant colours jostling and vibrating on the large canvasses. I was fascinated by the rhythm and energy of these…