This first two compounds here are of twelve pentagonal pyramids.

The next one is a compound of six square-based pyramids.

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This first two compounds here are of twelve pentagonal pyramids.

The next one is a compound of six square-based pyramids.

The polyhedron shown above is the final stellation of the icosahedron, while the one below is the rhombic triacontahedron’s final stellation. I made these using *Stella 4d*, which you can try for free at http://www.software3d.com/Stella.php.

I made this using *Stella 4d*, which you can try for free right here: http://www.software3d.com/Stella.php.

To make this, I augmented the pentagonal faces of an icosidodecahedron with pyramids, while the triangular faces of this icosidodecahedron had pyramids excavated from them. The result, as you can see, looks like an icosahedron with tetrahedral indentations is the middle of each face. I made it using *Stella 4d*, which you can try for free at http://www.robertlovespi.net/Stella.php.

Here’s a second view, in “rainbow color mode.”

I made these using *Stella 4d: Polyhedron Navigator*, which you can try for free at http://www.software3d.com/Stella.php.

This isn’t quite a near-miss to the Johnson solids, so I’m calling it a “near near-miss.” It could also be classified as a symmetrohedron. The pentagons and triangles are regular, but the red triangles have edges which are about 12% longer than those of the yellow triangles. The blue faces are isoceles trapezoids.

I found it while playing around with the great rhombicosidedcahedron using *Stella 4d*, which you can try for free right here.

I made this using *Stella 4d*, which you can try for free at this website.

Here’s another version of the same polyhedron, made using “rainbow color mode.”

In the previous post (here), I showed a great icosidodecahedron with its hexagonal faces replaced by inward-facing triangular cupolas. This one is similar, but the excavations take place on the decagonal faces, and take the shape of pentagonal cupolas.

Lastly, here’s a great rhombicosidecahedron with cupola-excavations performed on both its hexagonal and decagonal faces.

I made these images using *Stella 4d*, which you can try for free here.

This great rhombicosidodecahedron has had its hexagonal faces replaced by indentations, each the shape of a triangular cupola. I made it using *Stella 4d*, which you can try for yourself, free, at this website.

Each of these symmetrohedra has 302 faces. The one above was created by using the “morph duals by expansion” function, on the snub dodecahedron, in* Stella 4d*, the program I use to manipulate polyhedra (go here if you want to download a free trial of this software). It has twelve regular pentagons, sixty almost-square rectangles, and eighty equilateral triangles, along with ninety more obviously non-square rectangles, and sixty irregular pentagons.

I next used Stella’s “try to make faces regular” function, which produced this result:

This second polyhedron has 72 regular pentagons as faces, along with 20 equilateral triangles, 60 narrow isosceles triangles, and 150 irregular quadrilaterals. That’s 92 regular faces, in each of these two polyhedra.

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