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Two flourite crystals, with the shape of regular octahedra.
The flag of Morocco has a dihedral symmetry of type D1. If we consider only the star, we h...
The flag of Germany has a dihedral symmetry of type D1.
The flag of Europe has a dihedral symmetry of type D1. The 12 equal stars can't produce a ...
These windows in Corso Magenta in Milan are characterized by the scheme of the Borromean r...
Lower and upper face of the leaf of Viola sp. This photo, taken from the right point of v...
A fruit of country elm-tree called Samara (Ulmus minor). A photo of the fruit like this, t...
