Spirograph Maker

http://isotope3.net/

How to make a Spirograph

http://www.vimeo.com/3930278

Spirograph Laser Show

http://www.youtube.com/watch?v=QXLjxvt50VU


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Given any pendulum, the time taken to drop a ball will not change even if it is dropped at different positions. This is how clocks are used.