# Icosians

**Ray tracing: **

The following 2 images are related in that they are regular
arrangements of dodecahedra. The first have 4 dodecahedra around each
vertex, making a hyperbolic space. The second have 3 dodecahedra
around each vertex, making parabolic space, a 4D ball.
The hyperbolic space was projected to a 3D sphere, which was cut in half,
so the inside can bee seen:

2006.03.19

And this is a stereographic 4D projection into 3D space of the icosian
group. It is also cut in half; this time so you can see the inner
foam.

2003.10.14

## Some more pictures

From the outside:

Nice triple symmetric cut:

Same cut, seen straight into:

Inner grid in a glass block: