600 Cell Envelope

The stereoptic image below, is a 600-Cell projected into 3-Space. These projections are orthogonal (there is no perspective). The edges shown in blue are the boundaries of the surfaces that enclose the 3-D form (Envelope) that are on the same side of the form as the viewer. See the Hypercube envelope page for instructions on how to view this figure.

2 Frequency Geodesic

600-Cell displayed in a stereo pair
If you take the time to understand this figure, you will discover that the envelope is made up of 80 triangular faces (40 of them on the side closest to you are bordered in blue). Topologically the envelope is an Icosidodecahedron with its pentagonal faces stellated. I believe Buckminster Fuller would describe this as a 2 Frequency Geodesic. I am not certain that all the vertices lie on the surface of a sphere, non-the-less the elements of a Geodesic are present. This figure has not been rotated in 4-space prior to it's projection into 3-space. That is, the vertices are located where positioned by Coxeter in Regular Polytopes. It has been rotated in 3-space to reveal as much information as possible. Before you attempt to count the 600 tetrahedral cells you should realize that some of the edges are superimposed!
If you have Red/Blue 3-D Comic Book glasses the following figure, which is identical to the one above, may be easier to perceive.
600-Cell in a red/blue stereoptic view

This envelope and the 600-Cell itself are duals of the 120-Cell.
Hyperspace600-cell
Last Revision: 12/19/96