My wife has a, Crystal on a Chain, hanging down and in front of our Southeast facing, living room window. When the morning sun hits the Crystal just right, at certain times of the year, it throws the above light spectrum images on the walls in the room … sometimes as many as 15 or 20 at once. Our Cat, Ming, loves to watch them. I must say, it is neat to see this. If we swing the Crystal the images bounce around the walls.