1. Attach the ball to the hankerchief with a string, as shown in the drawing. When you hold the hankerchief by the corners so the ball faces you, like in the picture, the audience will not know there is a ball there.
2. Then, if you roll the hankerchief, crumpling it, you can pull out the ball like it appeared from nowhere! Be careful, as you pull it out, not to break the string.
3. Drop the ball into the hat. Then, holding the hankerchief by the corners, flip it over the hat so that when you lift it up, you steal the ball back out. Then you're back to step one as many times as you like!
4. For your finale, lift up the hat and show it empty. The balls have vanished!