Contributed by Sharon Butler / In “Fecund Algorithms,” a solo exhibition of new paintings and diminutive sewn-canvas works, Joan Waltemath diverts gently from the quiet perfection of her previous work to embrace small accidents and contingencies. On view at Anita Rogers’s new light-filled second-floor gallery in Soho, Waltemath’s work looks exquisite in the elegantly appointed room, which boasts Greek columns and a long wall of oversized windows facing Mercer Street. Her pristine surfaces and cleanly delineated lines have become scruffier, less refined, and, arguably, more satisfying. A slightly less rigorous approach has yielded interesting insights about spontaneity, uncertainty, and impermanence.