The rest of George Hart's site is interesting as well, especially his encyclopedia of virtual polyhedra [1]. There is also a part 2 of "Mathematically Correct Breakfast" (this time a trefoil knot) [2], and his sculptures are worth looking at as well [3].

[1] http://www.georgehart.com/virtual-polyhedra/vp.html

[2] http://www.georgehart.com/bagel/knot.html

[3] http://www.georgehart.com/sculpture/sculpture.html