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In this sculpture, the base is made from white pumice, which is easy to carve but looks like a sturdy rock. You can see how the base holds the switch, as well as a plug for an external 3V power supply. White pumice washes up on beaches on the eastern coast of Nicaragua. They can be also be purchased online. I carved the pumice with a kitchen knife and screwdriver, and had to be careful not to cut too much. It has roughly the same strength as 2-week old bread. The only drawback is that it will conduct electricity, which means you must be careful with your wiring to avoid short circuits.