Gruppo di Diatomee, alghe unicellulari caratterizzate dal possedere un rivestimento ester...
A three-dimensional net of a hypercube (one of the six regular polytopes in four-dimension...
The decoration on this mirror is cyclic, of type C4, and it breaks the symmetry of the obj...
On the floor of the Room of the Columns (II-III century a.C.) at the Domus dell'Ortaglia i...
In Sintra (Portugal), in the castle du Pena, this decoration in azulejos gives an example ...
A rosette with cyclic symmetry of type C4 in the courtyard of a house in piazza S.Ambrogio...
A pavement with symmetry of type *442 in Ponta Delgada, in Portugal.
In Lisbon, in the altar of the church S. Roque this decoration in azulejos gives an exampl...
A pattern of type 4*2 in the paving of a Roman country-house in Vilamoura, Portugal.
On the Afsluitdijk dam in the Netherlands. This picture has been used in the posters at th...
