And Then There Were Four - Sponge Magic - Magic Trick
A spectator holds one sponge piece in his closed hand, the magician touches his hand with a and the piece multiplies to two.
The spectator then holds the two, and another touch of the hand causes them to multiply to three. Finally the three pieces are plainly placed in the hand, "Would you believe there are four now?" asks the magician. He touches the hand and when he spectator opens his hand, he only has one but a larger one cut into the shape of a figure four.
This is a simple, clean sponge routine that produces a great effect without any complicated moves or slights.