Hi All, just writing to say that my team are in the final stages of polishing our entry for pyweek 8. You can now download an .exe/.dmg or the source here. Below is an annotated final version screen shot explaing how to play:

Casey Duncan has just released version 0.9a of the py-lepton particle engine. Change list: Fix reference leaks in particle emission and domain generate methods  
Plane domains are now proper half-space geometries so they support __contains__, which means they can be used with the Collector controller.
Implement Point domain.
Implement arbitrarily orientable Disc, Cylinder and Cone domains.  
Add tunnel example.
Implement [...]