Devil's Box

Display a square box with a sliding door at the front and two slot holes on both sides in the middle, a metal rod, a stand, and a small block with a hole running through its center.
Open the door of the box, place the block on the bottom of the box, and close the door. Now, insert the rod through the slot and immediately remove the door to show that the block has magically floated up and has been impaled on the rod.

• This is a beautiful item made of teak wood.