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A frieze of type *∞∞, against the line of the horizon, at Iraklion (Crete).
At the Fortress Amber (around 1500-1727, Jaipur, India), this window breaks the symmetry o...
A courtyard of Ca' Granda in Milan. The colonnade of the arcade and that of the upper floo...
The picture shows what happens when you put just one ball in the kaleidoscope of the tetra...
The picture shows what happens when you put just one ball in the kaleidoscope of the tetra...
A subdivision of the sphere into 24 spherical triangles with angles 60°, 60°, 90°. Exhi...
A subdivision of the sphere into 24 spherical triangles with angles 60°, 60°, 90°. Exhi...
A hub with a dihedral symmetry group, a D3 group - if you ignore a few things… We can c...
Un rosone con simmetria diedrale, di tipo D4, sul soffitto della sala da pranzo di un albe...
A Ravenna, nella basilica di San Vitale, un rosone con simmetria diedrale, di tipo D4 (se ...
