Remove from your pocket a matchbox and a toothpick. Push the toothpick straight through the center of the box freely showing all sides with nothing to hide. Remove the toothpick and open the box. What they see is a solid heavy block that entirely fills the box! The solid heavy block can be examined.
No skill required.
No sleight of hand.
A self-working miracle.
The Great Match Box Illusion Design invented by Rob Stiff of Magic Makers