In typical Robert Moses fashion, when a 1961 urban renewal project added an ice skating rink to a blighted section of Brooklyn’s Prospect Park, it came along with an imposing facility and a 250-car parking lot. The change took a chip out of Frederick Law Olmsted and Calvert Vaux’s  diamond-shaped masterpiece, cutting off a lake at the southern end of the park from the broad pathway that winds around its perimeter.