xx Marvin teaches Spoo-Key! xx

A large mortice key slowly and mysteriously turns over in your hand. The key can then be given out for examination.

Secret: The special key in this set looks and feels just like an ordinary key, but has been ingeniously manufactured with perfect balance.
Just the slightest tilt to your hand will cause it to roll over. The position of the key on your hand is very important. Place the key on your right hand with the ‘teeth’ facing towards your wrist.

Care should be taken to make sure the ring-end is free from your hand so as to allow the key unhindered movement. Now, tilt your hand very slightly forward so that the key gently rolls away from you.

The balance of the key is so good that it takes only the slightest incline to cause it to turn. If your hand looks as if it is on an angle, you are not doing it correctly. Your hand should appear absolutely level at all times.