[John Clarke Mills] has pieced together this tastefully done Victorian style Nixie tube clock. He picked up a kit from nixietube.com and an old clock off of eBay. A little bit of elbow grease and solder later, he has this very nice mantle piece. Well done.
For those unfamiliar, a Nixie tube is used for displaying numbers or letters. They are a glass tube, filled with a gas (usually neon). There are metal structures inside that glow when electricity is applied. First widely used in the early sixties, Nixies were pretty much replaced when LED technology got cheap.
[via Retro Thing]