  The classical massless SU(2) field theory has an infinite number of gauge
equivalent representations of the vacuum. We show that among these there exists
a non-perturbative center vortex representation with some similarity to the
quantum vacuum of the same theory. This classical SU(2) vacuum consists of a
lattice of center vortex pairs combining to triviality. However, this
triviality can be broken by perturbations, for example by adding a mass term,
or by considering the electroweak theory where the Higgs field does the
breaking, or by quantum fluctuations like in QCD.
