The British painter Bridget Riley creates energy with stripes, circles, triangles, and rhomboids, geometries that move like murmurations. Before executing her paintings, she does elaborate studies, sometimes with pencil on graph paper and other times as finished gouaches. Riley’s experiments began in the 1950s with plays on Pointillism; in the 60s she moved to her Op art style, using black-and-white patterns to explore the dynamism of seeing. More than 75 studies, including early figurative and landscape drawings, are the focus of an exhibition that begins with Riley’s student days in the 1940s and travels to the present. —Elena Clavarino