I made both of these while playing around with Stella 4d: Polyhedron Navigator, a program you can try out for free at http://www.software3d.com/Stella.php.
Two Non-convex Polyhedra with Cuboctahedral Symmetry
RobertLovesPi.net
Polyhedra, tessellations, and more.
RobertLovesPi.net 
These are Glorious!
On Wed, Jan 16, 2019 at 6:52 PM RobertLovesPi.net wrote:
> RobertLovesPi posted: ” I made both of these while playing around with > Stella 4d: Polyhedron Navigator, a program you can try out for free at > http://www.software3d.com/Stella.php. ” >
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Why, thank you!
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