“No matter what I do,” the late Ed Clark told The New York Times in 2014, “there’s not a day that I’m not an artist.” Perhaps that’s what Clark was thinking in the 1950s, when he contemplated a push broom and decided to use it as a huge paint brush. “The motions of the strokes give the work life,” Clark explained. He also began working on shaped canvases—ovals, circles—the first American artist to do so. Clark moved between New York City and Paris, and his paintings blend America’s Abstract Expressionism with European Modernism. Works from three decades of his career, spanning the 1970s to the 1990s, are on view in this show, Clark’s first survey in the U.K. Note the shift from more carefully crafted abstractions to a looser hand. —Elena Clavarino