Here are a couple of light paintings I did using my mobile phone playing the animation you see at the bottom. A similar effect could be achieved with optical fibers and a strobing light but it would be near impossible to distribute so many different colors so randomly.
On this first one I added a swipe of air bubbles in a water tube lit by a blue LED and on the second I did a camera rotation with a glass sphere in the middle. I used diffraction grating on both for an extra dash of RGBness and opted for a cold white balance.
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