Magic? Anti-gravity? No. Strong repelling magnets. Place the metal tip against the glass, then spin the axle. The friction point between the tip and glass helps the floating axle rotate for several minutes. Stimulate conversations about forces, perpetual motion, magnetism, or mechanics. For a light and optics demo, use a stroboscope to make the axle's rotational direction appear to go in reverse. Assembled size (with glass), 5-1/2 x 3-1/5 x 2-7/10" H. No batteries needed. Includes instructions.