Build a musical ice theremin by programming a micro controller, like a Pico Cricket to respond to resistance generated by the ice melting, or the ice being touched. The Pico Cricket then plays back sounds based on the resistance it reads. This activity requires a micro controller (Pico Cricket). This activity can be made into a two-hour workshop, as long as you prepare the ice ahead of time. No programming experience required. The videos of Paul Doherty, of the Exploratorium, are very helpful in explaining how an ice theremin works. Note: some of the electronics in this activity are outdated, please substitute the Pico Cricket for the MIDI board.