I have no idea what these are called, maybe you can help me. They are a led matrix with like 8 LED's in a vertical line, which change there state based on a rotation. While the LED's move in a circle or a curve path, the LED's change state to create the illusion of graphics or text in empty space. Anyone know where you can buy one of these? or have information on them or what they are called? Thanks! (there usually expensive novalty items)