Leibniz’s view is sometimes caricatured as: Spinoza with infinitely many substances rather than just one. These substances Leibniz called monads (Leibniz [1714] 1989). Since they are true substances (able to exist independently of any other thing), and since they are absolutely simple, they cannot interact with each other in any way. Yet each monad carries within it complete information about the entire universe. Space, for Leibniz, was reducible to (non-spatial) similarity or correspondence relationships between the intrinsic natures of the monads.