Pendulum Waves... And I can connect everything to sewing if I try hard enough...

Check out the math here! WOW!

Everything is connected to math. You can see it in every aspect of sewing if you have an eye for it. Anyway, I just wanted to share!
Not a Mathematician, just geeking out about it:-)
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