Check out this amazing robotic clock, the Stonehenge Robotic Digital Clock.
The clock uses a simple robot to arrange the 14 numbered cards that show the time, check out this video of it in action.
As you can see from the video it takes around 50 seconds for the robot to change the time from 12.09 to 12.10, I have to admit this is really cool, and I would love one of these to wake me up in the morning.
Norris Labs via Oh Gizmo