Luminglas plasma discs are wonderful flat plasma lamps that react to touch and sound. They used to be available in various sizes and colors in the past but companies stopped making them a while ago. Now they are showing up again on eBay and Amazon. This is a 18-inch multi-color plasma disc that reacts to your music. It is super thin and has a couple of knobs in the back that you can use to change pattern and sensitivity.
⚡ 16-inch Blue Square Luminglas Flat Plasma Lamp -- Gadgetify
You can use these flat plasma discs to excite neon and other gases. Put multiple units around a speaker for an even more trippy effect.
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