Kyushu Electric Power, Energy Fair Exhibition
The “Photophilous Beetle” lives on light. The world inside the transparent ball is an aquarium just like the Earth. It is a world where the living things keep moving, as long as light is given. The Beetle measures 12 cm, and contains a solar cell, a motor, a super-capacitor and some control circuits. The Beetle stays immobile under the spotlight placed at the center of the stage until it is charged to a given amount (on a full stomach). The Beetle with its stomach full freely moves around on the stage. When the battery is exhausted (empty stomach), it comes down the slope spontaneously and stops. It moves around with the solar cell placed at its top due to the action of a weight, and the body of the acrylic ball itself acts as the wheel.