The Logic Off Topic list

>>I worked with a guy who did a LOT of research in fractal rendering
>>(in 4 dimensions no less!), and we created a soundtrack for one of
>>his animations that was based on IFS (iterated function systems).

IFS was founded by a mathematician named Barnsely I believe. I bought his 
book on the subject in 1989  - its a  very fascinating book. His method is to 
use "affine" transformations which are a combination of rotations, 
reflections, stretches, compressions, and translation. Take several of these 
functions (which are expressable as matrices), and start with a single point 
- and randomly apply one transformation or the others - if you plot all of 
the points you get a fractal dust of sorts. I wrote some programs to do this 
and they created a lot of great graphics.