Don’t even bother with Roman Opalka’s pale paintings in the front room, but skip (cautiously) into the main space, whose walls are covered in loosely hung reflective plastic, and where the only lights are the bare blue and red bulbs dangling under ceiling-mounted fans, making circles over shaking magnetic strips on the floor. The stunning installation, dubbed “Ballroom,” feels a little like being inside a giant replica of those lights on top of old police cars.