The dad, Jeff Highsmith, connected a series of PVC pipes and ran them between his two kids' rooms. In each room, an iPhone is hooked up to a Raspberry Pi--a small, bare-bones computer--that controls a hidden vacuum, providing suction in the tubes. When a container of teeth is loaded up in the pipes in one room, and the iPhone system used, the teeth are launched to the other room. By stealthily sneaking away to the other room after the teeth are launched, Highsmith or someone else can retrieve the teeth, and in return send back some change. Later, presumably, the teeth will be forwarded to the Tooth Fairy.