And of course, there's the Nixie tube. https://www.youtube.com/watch?v=wxL4ElboiuA https://www.youtube.com/watch?v=wxL4ElboiuA (Previously posted in https://n

And of course, there's the Nixie tube. https://www.youtube.com/watch?v=wxL4ElboiuA https://www.youtube.com/watch?v=wxL4ElboiuA (Previously posted in https://news.ycombinator.com/item?id=12623738 https://news.ycombinator.com/item?id=12623738, the maker's web site via https://news.ycombinator.com/item?id=12308974 https://news.ycombinator.com/item?id=12308974, and covered in an IEEE article via https://news.ycombinator.com/item?id=17397133 https://news.ycombinator.com/item?id=17397133)