This device uses a fan to turn a propeller which make a wire bounce upward. The bouncing wire makes contact with another wire closing a simple LED circuit momentarily. The LED flickers on/off rapidly; this light is sensed by the phototransistor of the optical theremin creating a pulsing/laser-like sound. The fan will use a magnetic contact as a switch; where the magnet is used to adhere the contact to the drawing surface.Close-up of switch. (one wire bounces just enough to allow electrons to transfer to the other, at times no physical contact is required to close the circuit)
Here is a video of the preliminary version of the fan in action:
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