Mikhailtech take a look at Logisys' Thunder kit, an object-reactive liquid neon tube.

Like other lights the Thunder kit is plug & play. While it's not as bright as cathodes, it more than makes up for it with its coolness factor. The tube has a steady green glow while brighter spirals go crazy within. These spirals don't have a constant pattern, but instead react to the presence of nearby objects. Holding the tube up in the air will create a very slow moving effect; gripping it in your hand will make the spirals move a lot faster. It's very entertaining to see them speed up and slow down as you move your hand closer or farther away. It doesn't seem to be reactive to sound or light though, so don't expect any synchronization with games. Here's a short video showing the light in action.

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