The 24-cell is a regular 4D polytope that is made from 24 octahedrons. Use the three angles and the viewing radius to look at it from any direction. You can also change a few other things. Over the years, I have built several models of this from different perspectives. I really enjoy being able to see them all in the same place. Enjoy. 9/6/15: Modified the SCAD code to allow the edges to taper. Edges closer to the viewpoint are thicker, edges that are farther away are thinner.