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Unicellular alga covered in silica. The photo of this diatom seen under an optical microsc...
A Ravenna, nella basilica di San Vitale, un rosone con simmetria ciclica, di tipo C4.
A Ravenna, nella basilica di San Vitale, un rosone con simmetria ciclica, di tipo C4.
The main gate at the entrance of the Department of Mathematics in via Saldini in Milan, sh...
Among the Roman mosaics at the Domus dell'Ortaglia in Brescia, an example of rosette with ...
A lace with dihedral symmetry of type D4.You can see an other one.
If we put any object between two incident mirrors at angle that divides 180° (36° in the...
A flower of Fagaria vesca, the edible strawberry frequently found in forests. A photograph...
A hub with a cyclic symmetry group of type C5 - if you ignore the writing at the centre â€...
The scheme of symmetry of this uncoloured drawing is of type D6. If we consider the colour...
