"... the phenomena of spontaneous symmetry breaking in the radical sense of non-symmetric behaviour is rather related to the fact that, for non-linear infinitely extended systems (therefore involving infinite degrees of freedom), the solutions of the dynamical problem generically fall into classes of "islands" or "phases", stable under time evolution and characterized by the same behaviour at infinity of the corresponding solutions. Since all physically realizable operations have an inevitable localization in space they cannot change such a behaviour at infinity and therefore starting from the configurations of a given islands one cannot reach the configurations of a different island by physically realizable modifications. The different islands can then be interpreted as describing physically disjoint realizations or different phases, or disjoint physical worlds associated with the given dynamics."