  We argue that the non-observability of the spontaneous breakdown of Lorentz
symmetry (SBLS) caused by the vacuum expectation values of vector fields could
provide the origin of all internal symmetries observed. Remarkably, the
application of this principle to the most general relativistically invariant
Lagrangian, with arbitrary couplings for all the fields involved, leads by
itself to the appearance of a symmetry and, what is more, to the massless
vector field(s) gauging this symmetry. A simple model for the SBLS based on
massive vector and real scalar field interactions is considered; it is found
that spontaneously broken gauge symmetries could also appear, when SBLS happens
and is required to be physically unobservable.
