Here's a fascinating combination of technologies. This is a wooden pendulum clock that has been rigged up to display the time in a digital format. Every time the pendulum swings, an optical sensor is tripped. This sensor controls a motor which drives a transmission gear train, which in turn operates a very mechanical form of digital display.
The plywood clock component is a modified version of the Primus clock designed by David Atkinson.
Heres a video of the optical sensor that drives the display's transmission being manually triggered:
Here's where you can read a full article, see additional photographs, and video of this fascinating Analog Clock in a Digital World.
[ Thanks Elyasaf! ]