This is my open source, Raspberry Pi - controlled chain of lights hanging in my room. If you want to control the lights, click here
This is the API, accessible via http://tau.onnoeberhard.com/
This is the command line interface running on the Raspberry Pi. Whenever someone changes the lights, the cli prints it to the screen.
Here is @MrBesen's binary clock for tau: https://github.com/mrbesen/onnos-uhr