Plasma glass is lots of fun to play around with. It is usually filled with a noble gas and interacts with Tesla coils. This Neon Plasma Mug is a handmade mug that lights up when you get it close to a tesla field. It looks great during the day but especially so at night.
You may also want to see:
Plasma Mug for Tesla Coil ϟ Gadgetify ϟ
Probably shouldn’t put tea in it though. More info is available here.
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