 "Tzimtzum" (Constriction/Concentration) is the primordial cosmic act whereby God "contracted" His infinite light, leaving a "void" into which the light of existence was poured.This allowed the emergence of independent existence that would not become nullified by the pristine Infinite Light, reconciling the unity of the "Ein Sof" with the plurality of creation.This changed the first creative act into one of withdrawal/exile, the antithesis of the ultimate Divine Will.