Earlier this year I broke my elbow. I was advised to work with an occupational and physical therapist to regain the movement in that joint. When I met with my physical therapist, she had just concluded a lecture on the fibonacci sequence. She explained how the golden ratio could be found in every bone and joint in the fingers, hand, wrist, forearm, elbow, upper arm, shoulder, et cetera. Having taken more than a typical amount of science and math related courses in school, I was surprised to learn how little I knew on the subject.I was browsing a site recommended to me more than a few times by a professor in college and came across this video. The link posted is from youtube because linking to the original site did not allow me to specify which video I was referencing. Nonetheless, the khan academy is a wealth of information I highly recommend perusing when you want your freaking mind blown!
mk: I was a bit disappointed that Khan brought up the nautilus shell. It doesn't actually follow the golden ratio. I think your therapist bought into a bit of the golden ratio mythology too.http://www.maa.org/devlin/devlin_05_07.html
It's a cool and important ratio, but it's not nearly as ubiquitous as many suggest.
I love these videos though. It is such an amazing resource.