A clapper

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A dihedral symmetry of type D1 in this clapper in Milan.
From the point of view of topology, it is a torus, that means, a sphere with a handle attached.

© Felice Brambilla

foto di Felice Brambilla

The image belongs to the sections...:
Door knockers (Anthology of images)
Door knockers (Symmetry)
Objects (Topology)

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