There’s an eye-opening show downtown at the Sackler Gallery through January 25: the monochromatic seascape photographs of Hiroshi Sugimoto are matched with pastels of the Maine coast by Dwight Tryon, an American tonalist and follower of James McNeill Whistler. One is tempted to write off Tryon as a fussy, anti-impressionist relic of the nineteenth century, but look again: the sparse linearity of his works, nothing but horizontal bands of color washes, makes a connection with twentieth century artists like Mark Rothko. There are some more Tryons on display with Whistlers next door at the Freer.