I was doing laundry and saw some lights out of the corner of my eye outside, flashing like an emergency vehicle. i went to the window (1st floor) and saw an object go by at about the 3rd - 4th floor level. it seemed to be rolling with lights rotating around its axis, not its equator. all the lights were white. it rolled down 11th ave and out of sight over a park. the lights were bright enough to reflect off the buildings across the street - very bright. no sound, emissions, or other features that i noticed - i simply did not have time to observe it for very long before i was out of sight.