The map of São Miguel island could be easily drawn as a set of patterns which cover the main streets and plazas.
Opposites may attract in infinite ways. Symmetry, though, can only be achieved in 17 ways. And this exact number was proved by Mr. Evgraf Fedorov in 1891.
It is really amazing how Portuguese little towns, with their traditional small white houses and their nice, cozy, old-school vibes, can also be the scene of some stunning optical designs.