The visible penetration of one solid through another.
The magician places a quarter on the lid of the box pictured above. Covering the coin with a playing card, the magician taps the lid of the box. The coin penetrates the box top. Removing the card from the lid shows the spectators that no duplicate coins were used to accomplish the effect.
Easy to do. Complete with all necessary props, instructions and that "special something." Made in the USA by FUN Incorporated.