Arthur Danto has described Lynn Saville as New York's answer to Eug?ne Atget, because she "prowls her city at the other end of the day, picking up pieces of the past in the present, just before it is swallowed by shadows." For her new monograph, Dark City, Saville focused on vacant spaces--shuttered storefronts, back alleys, blank billboards, empty lots--with the occasional ghostly figure hurrying through the frame. Working at twilight and...