Turnvater Janosch has created a fun looking Mechanical Ball Clock. No controller here, this thing is powered by a falling weight.
Via: Laughing Squid
“The clock runs for 12 hours, driven by a weight of 2.5 kg sinking approx. 1 meter during that time..Every minute a marble is lifted up and goes down a marble run with three flipping traps that count marbles for minutes, five-minute-steps and hours.
The timekeeping element is a second-pendulum with a pinwheel escapement.”