This is very cool. Patterns we recognize based on the length of 50 
swinging pendulums. Thanx to Arthur Maglin for digging this up.

- Mitchel

Click on:
<http://sciencedemonstrations.fas.harvard.edu/icb/icb.do?keyword=k16940&pageid=icb.page80863&pageContentId=icb.pagecontent341734&state=maximize&view=view.do&viewParam_name=indepth.html#a_icb_pagecontent341734>Pendulum 
Waves








http://www.MitchelCohen.com


Ring the bells that still can ring,  Forget your perfect offering.
There is a crack, a crack in everything, That's how the light gets in.
~ Leonard Cohen