Control their power!
A fascinating demonstration of strength- or lack of it! An unbelievable exhibition of magical powers!
This amazing mystery is one that your audience will be talking about for a long time to come! It is a smaller version of the famous Light and Heavy Chest, the trick that stopped a revolution! (See History and Trivia below)
And it is so easy to operate! Display the box to your audience. Set the box on a table. Ask a member of the audience to join you for the Light and Heavy experiment. Let him lift the box- he can do it easily. Mention that you have the ability to take his strength away, merely by possessing some personal item of his. Let him hand you any item from their pocket- a ring, a coin, a handkerchief. Place the item inside the box, and close it up. Now when he tries to lift the box, it's REALLY heavy! It's like his strength is gone! Of course, after you open the box again and return the item, he is now able to easily lift the box!
This is a beautiful piece of quality apparatus. No assistant or stooge is needed- you use a real person selected from your audience. You can show the box freely from all angles, so you can do this one surrounded.