CP got a nixie tube clock for x-mas this year. Nixie tubes were used in the 50s - 70s before LEDs took over. The tubes are brand new, but were probably made in Russia 30 years ago. It came as a kit and it took him an entire day to solder all the components in place. The whole thing is run by an Arduino-compatible microcontroller that came pre-programmed.
There are some blue LED's under each tube that make it look really cool at night.
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