his lively show purported to examine how artists use color to define space or structure, but it also demonstrated how the geometric tradition in art remains alive. There were echoes here of Josef Albers, Frank Stella, Ellsworth Kelly, et al., but with ingratiating twists. Several works, by Richard Roth, Cordy Ryman, and Martha Clippinger, mediated between painting and sculpture, hugging the wall but jutting slyly into the viewer’s space. Jason Karolak’s little paintings packed a punch as neon-colored geometries dissolved from plausible structures into puzzling cat’s cradles. Maureen McQuillan’s luminous abstractions were as ephemeral-looking as smoke rings, while Rob de Oude’s square-gridded fields seemed to marry Op Art with Agnes Martin; Paul Corio took the grid even further into Op territory with his dazzling Megalicious (2011).