The vacuum is permeated by a constant Higgs field, does this bring the old “ether” back? No, velocities relative to the ether were thought to be detectable. The vacuum of the Standard Model does not make that possible, given the spin-0 nature of the Higgs field. Yet the other substance permeating our Universe, the CBR, constitutes an absolute system: the one in which it is maximally isotropic.