Hope your little boy is enjoying all of this stuff!
In case you haven't seen it already, my youtube page:
http://www.youtube.com/user/WildStar2002
A bunch of short hyperdimensional vids + a few other things (like an exploding
planet animation ;-) )
Also, have you considered getting him the Stella 4D software?
http://www.software3d.com/Stella.php#stella4D
1849 uniform polychora would keep the little tyke busy for awhile. :) It has
all the 3D polyhedra as well.
- cheers!
- wild