More concrete. The angled one is very clever. Designed by Joachim Manz. "Trabant pendant lamps comes in two versions, Trabant 1 has a thin lane in the concrete that allows rotating and tilting the lamp, while Trabant 2 does not."
The battery is connected to the bulb which has potential and chemical energy. Potential energy is the energy stored in an objects position. Chemical energy is the part of energy in an object that has a chemical reaction when it is released.