During a one week workshop, we had to dismantle as many machines as possible, and re-use the parts to build another one. Here, we used Videotape Recorder, printers, radios and computer parts to build a track for a metallic ball which activates step by step, different circuits. When the white ball guide touches the metal grid, it activates the radio. Next, the metal ball falls in the crater, it closes a second electrical circuit, which powers the electric motor. The system is similar to bumper cars's. (Work done with my friend Romain Lupino)