C2 or C4?
This rosette on the floor of the Duomo in Amalfi (Salerno) has a cyclic symmetry, that is of type C4 if we don't consider the thinner decorations, and of type C2 if we take them too in consideration.
© matematita
The image belongs to the sections...:
2. (C2) (Symmetry)
4. (C4) (Symmetry)
Decorations of floors (Anthology of images)
Decorations of floors (Symmetry)