What does Bridget Riley’s art mean? We might imagine that a wall painting titled Cosmos (2016–17) referred to life within a cosmos, an order than encompasses us, whether natural or divine. The designation connotes a degree of philosophical speculation, unlike the direct descriptions that Riley occasionally employs as titles, such as Composition with Circles. But whatever meaning we derive from viewing Cosmos will be no more intrinsic to it than its name. Attribution of meaning comes after the fact and requires our participation in a social discourse. Every object or event to which a culture attends acquires meaning; and Riley’s art will have the meanings we give it, which may change as our projection of history changes. Meaning, in this social and cultural sense, is hardly her concern.