The design is reminiscent of the Sierpinski tetrix: placing four half-size tetrahedra corner to corner and adding an octahedron in the middle, a full-size tetrahedron is formed; this process can be repeated recursively to form larger and larger tetrahedra.
Bottrop | tetrahedron | Tetrahedron | Reuleaux tetrahedron | FSFE representatives at the ''OpenRheinRuhr'', Bottrop |