Tying Shoelaces

If you tie shoelaces in any 3-by-3 pattern, there will always be three collinear intersections. That is the Pappus's Hexagon Theorem.HQ original: http://www.youtube.com/watch?v=MbRSm6vxgYgContact me at: [email protected]: x_YAMABIKO_x

http://www.nicovideo.jp/watch/sm22638919