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Extraordinary Invariants are elements of the BRST Cohomology Space which areirrevocably dependent on Zinn sources. The existence of an ExtraordinaryInvariant means that the symmetry is broken in that sector, and that the fieldequations can almost rescue the invariance. Adding the Extraordinary Invariantto the action results in a new theory with constraints on the starting theory.So Extraordinary Invariants are seeds from which a theory can grow.  For a simple example, it is shown in this paper how Yang Mills theory isimplicitly contained in the BRST Cohomology of Free Gauge Theory. It comes froman Extraordinary Invariant which can be added to the free gauge action. TheJacobi Identities are generated by requiring that the BRST Poisson Bracket bezero.  Since the mechanism is a general one, it can be used to construct newtheories. Some of these, for example in Supersymmetric theories, have not yetbeen noticed using other methods.

Extraordinary Invariants are Seeds that Grow Interacting Theories Out of Free Theories