A stella octangula
The stella octangula is made of two tetrahedra that are disposed in such a way that their edges are perpendicular in the midpoints. The vertices of the stella octangula are the vertices of the cube. It can be reproduced between the mirrors in the kaleidoscope of the cube.
This image has been used in the posters on polyhedra realized for the exhibition Simmetria, giochi di specchi - Symmetry, playing with mirrors.
elaborazione grafica di Roberta Granà
The image belongs to the sections...:
Duality (3D geometry)
Two tetrahedra in a cube (3D geometry)
The symmetry group of the cube (*432) (Symmetry)
Posters about polyhedra (From the exhibitions of matematita)