A familiar Greenwich Village site is the 13-story geometric “wall painting,” but few know the identity or biography of its artist. The mononymic Tania (born Tatiana Lewin in 1920 Poland) fled to North America during WWII and left behind a formidable oeuvre. Untitled movingly portrays filmmaker Rima Yamazaki’s encounter with Tania’s work at the behest of her widower.