Philosopher Robert Nozick proposed the "Principle of Plenitude" (or of Fecundity), which proposes the existence of all possible worlds.
I have a feeling that it is different from David Lewis' Modal Realism, in the sense that it allowed more universes to exist, but I am not so sure about this.
So, is this true? Does Nozick's principle consider the existence of not only all logically possible worlds (as in Lewis' Modal Realism) but also of universes based on radically different fundamental systems of logic? (E.g universes based on non-classical logics like on fuzzy logic, on intuitionistic logic, on paraconsistent logic...)