HULSE! When your device turns into a heart monitor.
Imagine finding the spectator's card using their heartbeat! With HULSE, you will be able to reveal several different shapes, using your own phone. Have your spectator select a card, or think about an ESP symbol, an animal, etc. Plug a headset into your phone. Now explain that the left earphone is designed to listen to heartbeats, and the right one to actually feel the beats. You open the heart monitor on your phone and you start taking your own pulse. You can see the beats on the screen. Then take the spectator's pulse, and finally, ask them to think about their card, animal, ESP symbol, etc. Suddenly, between the pulses on your screen appears a drawing of the spectator's selection or thoughts!