A seismic shift in the art scene here is the southerly drift of galleries. The Minnesota Street Project, deep into Dog Patch, is one-stop art shopping, a maximally minimalist cache of galleries. Try it on Saturdays since the parking is ridiculous Before they leave the Union Square district you might want to have a last look at two of our most reliable galleries. Fraenkel’s final show on Geary has Christian Marclay turning the grubby sidewalks of London into a light show worthy of the Fillmore. [correction: Fraenkel is not moving] At Berggruen a retrospective of the mother of op art, Bridget Riley, is freshly dazzling.