Subnature

See Subnatural Subnature stands in relation to Nature as Nature stands to Supernature. Lewis definition of Nature as a closed interlocking system forces things that are not part of it to connect to it view some suspension of the system. Randomness, were it truly without a causal account would be outside of the system. In the same way he sees Reason as being outside the system on the other side, i.e. a Supernatural phenomenon insofar as it gives us a true understanding of Nature.