This began with an {8/3} star octagon. It then started spreading.

# A Starry Icosidodecahedron

The stars on the pentagonal faces were drawn using *Geometer’s Sketchpad* and *MS-Paint*. The icosidodecahedron itself was created using *Stella 4d: Polyhedron Navigator*, which you can try for free at http://www.software3d.com/Stella.php.

## Seven Stars

### Image

# An Excavated Tetrahedron

Polyhedral excavation is the opposite of augmentation. In this excavated tetrahedron, short pyramids have been removed from each face. I made this using *Stella 4d*, which can be tried for free at this website.

# A Compound of Three Elongated Tetrahedra

I made this using *Stella 4d*, a program you can try for free at http://www.software3d.com/Stella.php.

# Four Octahedra

There’s a tetrahedron in the center of this figure, but you can’t see it because it is covered on all sides by octahedra. I made this using *Stella 4d*, which you can try for free at this website.

Here’s another version, with a different coloring-scheme.

# Five Tetrahedra

I made this variation of Kepler’s* Stella Octangula*, using *Stella 4d*, software you can try for free at this website.

# The Dual of an Augmented Tetrahedron

If someone had showed me the polyhedron above, a week ago, and asked me to explain how it was constructed, I would have had a hard time coming up with the answer. I made it using *Stella 4d *(which you can try for free here). It’s the dual of the polyhedron shown below, which was made by augmenting the four faces of a tetrahedron with identical tetrahedra.

# Two Versions of a Fifty-Faced Symmetrohedron

The first version of this polyhedron was created by zonohedrification of a tetrahedron, based on that solid’s faces, edges, and vertices. All of its faces are regular polygons, except for the red hexagons.

I used *Stella 4d: Polyhedron Navigator* to make these (and you can try that program for free at this website). The next thing I did was to apply *Stella*‘s “try to make faces regular” function to the solid above, producing the one shown below. In this second version, the only irregular faces are the yellow isosceles trapezoids.

# Augmenting, then Reaugmenting, the Octahedron

The blue figure above is an octahedron. The next image shows what happens if red octahedra are used to augment each of the blue octahedron’s faces.

The third image shows what happens if yellow octahedra are used to augment each red face in the second figure.

These polyhedral images were created using *Stella 4d: Polyhedron Navigator*, which you can try for free at http://www.software3d.com/Stella.php.