This is a Crookes Radiometer. An old physics department staple. What does it do? On exposure to light or heat, the vanes turn on a low friction mount. Here a green laser (14 mW green and 9 mW infrared) starts it turning.
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A compact copper ring with a bright green LED, turned on by a hidden microswitch.
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Using liquid nitrogen with a Peltier effect device to generate a massive 45 mW of power with a temperature differential.
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