Titled “Double Portrait,” this electrifying exhibition unites Mimi Gross and Marcia Marcus, who began making figurative paintings in the 1950s. Born 12 years apart, Ms. Marcus and Ms. Gross crossed paths in downtown New York, as well as on sojourns to Italy and Provincetown. Both were putting paint to canvas at a time when Minimalism and Conceptualism reigned supreme, and both were interested in representations of their gender.