An amazing magic trick featuring a solid clear box, a solid clear cover, a solid ball and a rubber band.
The cover is placed on the box, and the whole thing secured with a rubber band. The box is covered with a handkerchief, and the ball placed under the hanky, on top of the box.
Now comes the magic. Your audience will see the ball sinking into the box. The handkerchief is removed and the ball is really inside the box. The ball is removed and the spectator can examine all the props.