Fluxus (pawfal.org/fluxus/) is livecoding and 3D prototyping system using Racket (ancestor of Scheme + some 3D/OpenGL-based enhancements) as the main programming language.
I am using a simple example of solar system simulation to demonstrate you the possibilities of this tool.
Here is the code: paste.pocoo.org/show/301220/
Screenshots: dl.dropbox.com/u/928694/blog/ru/img/fluxus-solar-screen04.png, dl.dropbox.com/u/928694/blog/ru/img/fluxus-solar-screen05.png
[ Sorry for the quality of my English, this is my first screencast recording, I will train myself better next times :) ]