Programmatically Generate Random Celtic Knots (C++)

I downloaded and ran the binary. It's a pretty neat screensaver! Seems to work fine on Windows 8. It even looks good on multiple monitors, which is impressive for something from 2008.

I wish the author had documentation on the algorithm somewhere. The code has comments, but I didn't see anything that talked about the high level approach. The neat thing is that it makes a giant, random knot, but if you follow each thread it alternatives between going over and under each thread it crosses.