Doodling in Math Class / by urbanexus

At the NPR website there is a fascinating post with a link to a video (see below) by Viv Hart who is self-described as a "a recreational mathemusician currently living on Long Island." [youtube=http://www.youtube.com/watch?v=heKK95DAKms&w=640&h=510]

Now I feel vindicated for all those years I spent doodling in math class in middle school and high school!  The only thing is, I did not understand the theory behind why I was fascinated by drawing the "overs and unders."