The quest for discovery through looking is the driving force of Bridget Riley's work, as she has written: "More than anything else I want my paintings to exist on their own terms. That is to say they must stealthily engage and disarm you. There the paintings hang, deceptively simple--telling no tales as it were--resisting, in a well-behaved way, all attempts to be questioned, probed or stared at and then, for those with open eyes, serenely disclosing...