Eug?ne Atget's Parisian storefronts paired with Thomas Struth's desolate views of Wall Street; Charles Sheeler's studies of Ford Motor Plant contrasted with Bernd and Hilda Becher's "Blast Furnace" series; Walker Evans' sharecroppers alongside Rineke Djikstra's troubled late-twentieth-century teens. These are just some of the surprising and delightful editorial matches to be found in "How You Look At It: Photographs of the Twentieth Century." Intelligently...