On Duality

I got to reading about ontology after pondering a friends predilection to use the word semantic. The papers and definitions I was reading pointed out differing schools of thought regarding the differentiation between entities and collections of entities and asked the question "What categories of being are fundamental?" I prefer to think of every human conceived entity as a categorization and that fundamental being or existence is that which is without categorization. Us humans seem to have difficulty with non dualist concepts like this. How can we understand that which is not categorizable? It requires a different form of understanding than we commonly acknowledge using. One based on the experience of intuitive recognition rather than logic. Perhaps the ability to recognize the uncategorizable stems from the fact that we are the uncategorizable.