A better answer than any that Luke cited would start with the network of causal laws paradigmatically considered "natural," such as those of physics and chemistry, then work toward properties, relations, objects and facts. There might (as a matter of logical possibility) have been other clusters of causal laws, such as supernatural or non-natural laws, but these would be widely separated from the natural laws with little interaction (pineal gland only?) or very non-harmonious interaction (gods defying physics).

We had a discussion about this earlier. I will try to dig up a link.