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Oh, sort of like a LED wand.[1] Those were a popular toy for ravers a few decades back. Hard to find now.<p>[1] <a href="https://tinkersphere.com/soldering-level-i/3355-magic-message-pov-soldering-kit.html" rel="nofollow">https://tinkersphere.com/soldering-level-i/3355-magic-messag...</a>