Bridget Riley with her Op Art, 1963Photography by Ida KarBridget Riley is synonymous with the stripe; a fact which is currently being celebrated in a show at the David Zwirner Gallery dedicated to her mastery of the line. This exhibition, Riley’s first in London for more than a decade, is a reminder of how great an artist she is. A pioneer of op art in the 60s, she has dedicated the best part of her career to the exploration of pure colour and form and there is perhaps no other livi...