I find this totally amazing. In this 4 minute video you'll see 32 matching metronomes standing in formation on a moving surface. They're all set in motion one after the other so none have the same start time. Then, as time goes by, something seemingly magical happens - Each metronome begins to subtly change its rate of ticking, and eventually--THEY ALL CLICK TOGETHER--!
The mechanics going on here that makes this possible is beyond me. Somehow the movement of the surface the metronomes are standing on is the one factor that effects all of them - They vibrate the table, it returns the vibration, and somehow the result is synchronization. All I know is it's amazing.
This is from the metaphysical site "American Kabuki." If you're interested in taking a look at the philosophical point being made about this metronome phenomenon, here's the link: