You show a nice little wooden box with plexiglass windows on the top and bottom. The box contains three large dice (approx. 20x20mm).

You show the box from the top and bottom and then slide it open. Remove one of the dice and put it in your pocket. Now you can show the box to the spectator from every angle. Shake the wooden box, and the missing die will appear. Now you can shake the box again, and the die will disappear and reappear in your pocket!

This routine requires no sleight of hand. Nothing is reloaded or secretly added. The effect is a marvel of self-working magic. A real gem!