While this won't fool your school principal a la Ferris Beuller's Day Off, it's still a cool project. This synth has a set of strings attached to DSP chips which "play" a certain sound when struck, or in this case, touched. The resulting music/cacaphony sounds pretty eerie.
It works like this:
When you lay your hand onto the controller, the tips of your fingers correspond to your mouth and your forearm corresponds to the back of your throat. The more you press down, the more you open that part of the throat.