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