bicycle parts and time on his hands, and this incredible clock was the result

Toon Boumans made this pendulum clock bike from a bike and miscellaneous bike parts, displayed at the Kerkrade Maker Faire

I have never seen such a piece of craftmanship before. He lives in a small village with a special collection of 48 bikes, collected over more than 50 years. 

found on http://www.bikehacks.com/bikehacks/2013/10/pendulum-clock-bike.html