Note that the triangles also spiral into themselves. But this is much easier to render in 2 dimensions than 3. A possibility is to use a 3-D printer like those used in rapid prototyping. That space occupied by an even number of tetrahedrons could be a tinted clear resin. I believe this would be a beautiful and hypnotic object.
Tessellation Strictly speaking tessellations are tiles that cover the plane without gaps or overlap.
I extend this idea into three dimensions though. I also label tesselations polyhedra that stack to fill space without gaps or overlap. Tessellations, My Blocks Vs Zaks Toys that tessellate have the power to approximate any shape. This page discusses this power and also contrasts my block with a similar toy that does not tessellate as well as Delta Blocks. This page discusses my toy which was inspired by M.C. Escher's print Flatworms.