This is neat, its a video of the sort of machines where one object rolls along triggering another object
Some of them are very imaginative!
Here is another, shorter, series
In Japan, the machines are called pitagora souchi, which means Pythagorean Machine
According o this talk [url=http://wwwdiggcom/links/Amazing_video_of_Rube_Goldberg_Machines_]here[/url]