Abstract paintings by an artist who was prominent in the seventies, disappeared in the eighties, and seems to have now recovered her equilibrium. The new works are handsomely geometric, in a style that descends from Mondrian and Klee: vertical stripes of color slide past each other, changing scale and hue, as if on a mechanised loom. It’s a classic modernist idiom, handled with more zest than one has any right to expect.