Celtic knots are beautiful and mathimatical. Click on the intersections to cycle through the three choices
This applet was created by Andrew D. Birrell and modified by John Berglund. The program and source code are available free, under the terms of the GNU general public license. Use at your own risk! The GNU general public license is available at http://www.gnu.org/copyleft/gpl.html
I got so inspired by the first applet that I went and wrote one that does hexagonal celtic knots. (Judeo-celtic knots?) Again, the program and source code are available free, under the terms of the GNU general public license.
You can reach me by e-mail.