Thankfully, this 60-tube Nixie clock bears that mold, and in a big way. The key to [limpkin]’s design is the IN-9 Nixie, which is the long, skinny tube that used to show up as linear indicators ...

There are various types of glass tubes like Nixies ... That’s exactly what [Jay Hamlin] did when he built a digital clock based on LED filaments. The heart of the project consists of orange ...