Facing west I noticed 6-8 box’s connected at about 170 degrees moving wnw at slow to medium speed, each box was connected in line and each box was outlined in bright white. Light at least width and length, I believe in depth and even perhaps in 3D.I turned around to point it out but the door was locked and I turned around to watch it again as it dimmed and disappeared one box at a time as if it moved behind a barrier.