A red sponge ball vanishes and reappears. During another attempt to vanish it, the spectator believes he knows how the trick is done -- and he points out that the ball is concealed in one of the magician's hands. Upon opening the guilty hand, the ball is seen to have changed into a large square. The other hand is opened to reveal a black ball. Easy to do. Priced so even a cheapskate magician can't turn it down.