A rosette D4

A rosette with dihedral symmetry of type D4 on the clapper of a main gate in Porto (Portug...

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A clapper

A dihedral symmetry of type D1 in this clapper in Milan.From the point of view of topology...

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A clapper

A dihedral symmetry of type D1 in this clapper in Venice.

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A clapper

A dihedral symmetry of type D1 in these clappers in Val Brembana, Bergamo.

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A clapper

A dihedral symmetry of type D1 in this clapper in Venice.

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