Several art dealers have closed up shop and left the city's art center on Newbury Street in the last year and a half. Some said they hoped to come back. Now Beth Urdang has. Her two new exhibitions are exquisitely rendered and easy on the eyes. Olga Antonova’s still life paintings explore pattern, design, and the reflective power of porcelain while sculptor Pat Lasch creates wood cakes in a provocative mix of Pop Art and something more baroque...