A regular tetrahedron. You can reconstruct it between the mirrors of the corresponding kaleidoscope. This picture has been used for the posters on polyhedra for the exhibition Simmetria, giochi di specchi - Symmetry, playing with mirrors.
elaborazione grafica di Roberta Granà
The image belongs to the sections...:
From "towards the 4th dimension" (From "XlaTangente")
The symmetry group of the tetrahedron (*332) (Symmetry)
Posters about polyhedra (From the exhibitions of matematita)
Tetrahedron (3D geometry)