Marbo Card Penetration
An eleglant walnut box with holes in the lid and the base, is displayed. The interior is just large enough to hold a, single playing card, which when inserted will block all, passage thru the holes. A gleaming steel ball bearing, completes the set. The card in place, the ball bearing is allowed to roll around the lid, finally dropping into the hole. It, is momentarily stopped by the card, but the magician commands the ball to pass, and it does, as through the holes from both sides. The impossible happened... solid through solid.