Years ago in college, generating fractals [1] with fractint [2] was a popular pastime among my group of friends. But it was mostly (if not entirely) two-dimentional fractals being generated.
But this three-dimentional Mandelbrot set [3]?
Wow!
[1] http://en.wikipedia.org/wiki/Fractal
[2] http://spanky.triumf.ca/www/fractint/fractint.html