‘It’s Always Summer on the Inside’ at Anton Kern Gallery features some pretty dark fare, from the Coke logo emblazoned with the word ‘blood’ to one of Joyce Pensato’s sinister Batman paintings, making Mary Heilmann’s ‘Mojave Mirage,’ a blessed burst of candy-colored happiness. Her signature technique of adding extra canvas to the conventional rectangular shape works a treat as the sands of a flat desertscape suddenly swoop and swirl. (Through Aug 17th.)