Icosahedron with Inverted Spikes on all Faces

Folding instructions: Sturdy Edge Module
This is the primary page for this model.
Paper: copy paper
Type: other modular polyhedron (implies: abstract modular, abstract, balls and polyhedra, geometric, mathematical object, modular balls and polyhedra, modular, multi-sheet, other polyhedra)
Author: Michał Kosmulski
Units used: Sturdy Edge Module, by: Dirk Eisner, Francis Ow, Michał Kosmulski, other/uknown, Tomoko Fuse
Unit count: 60
Colors: purple/pink
In albums: Models with Dubious Classification, Modular ② — medium number of units

Images are licensed under the Creative Commons Attribution-NonCommercial 4.0 International License

Compare with an octahedron built using the same technique (octahedron’s page also discusses the technique in more detail).

Just as was the case with the octahedron, I was not sure if I should classify this model under balls and polyhedra or spiky balls.