Metaphysics : Why do some things repeat themselves while others do not?

I like to think that it can be explained through physics and not completely through introspective considerations. Most things, if not all things, are bound to the laws of physics. So, in attempting to understand the answer to this question I draw upon physics. Things that repeat are naturally organizing themselves against the laws of entropy and in congruence with the laws of enthalpy. The generation of repeatable phenomena in such natural things as in the process of consumption and digestion occur in contra to entropy. They create an energetic stability of sorts, that leaves open the possibility of spontaneity and novelty building. What is your answer to why this works in the Kosmos?