Tornado Spheres: two ball bearings welded together can be made to spin up to 2000 rpm by the Magnus Effect using a stream of air. Looks (and sounds) amazing at high speed. Shining three colored LEDs on the spinning pair produces an illusion of floating rings along with a second illusion that these rings are rotating and changing direction due to aliasing with the frame rate of the video camera (like the famous wagon-wheel effect). ➡️ Follow the link in my profile for info on where to get this an