What is a Knot?

First in a series of videos about knots. Here we have Carlo H. Séquin from UC Berkeley.

More videos to come at: http://bit.ly/Knot-a-Phile

Edit and animation by Pete McPartlan. Film and interview by Brady Haran

With thanks to Rob Scharein for the use of his software Knotplot - http://www.knotplot.com/

Also with thanks to Maurice McPartlan