If we ignore the central hole (and the cigarettes, and also something else…), this manho...
If we ignore the central hole (and the leaf, and also something else…), this manhole cov...
A manhole cover with a scheme that represents an example of pattern of type 2*22.
A manhole cover that has symmetry of type 4*2. You can see also this other photo.
A manhole cover with dihedral symmetry of type D16 (if we ignore the writings on the exter...
