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A defining feature of this non-convex 20-sided polyhedron is that all of its dihedral angles are 90 degrees including the concave angles (blue edges) as well as the convex angles (brown edges).
It is also a “shaky polyhedron”. Useful in teaching geometry concepts.
Created by [David Hall](https://sketchfab.com/davidhall). This model has been used under a [Creative Commons Attribution license](https://creativecommons.org/licenses/by/4.0/legalcode).
