The universe is made up of two kinds of substances.
There is a problem with this statement: only one of the substances is numerical. It doesn't actually make sense to add them together and make two.
Sure, if you represent them with physical symbols, you can easily count the symbols and get two.
But if you represent them in pure consciousness, then...what? My first guess is you only get one: existence. We can say there's subjective and objective facets to existence, but the division between them is ultimately put there due to human limitations, somewhat arbitrarily, not because there's a true difference between these shades of existence.
I don't know.
I'm thinking everything humanity properly knows about consciousness could fit into a single seminar. It doesn't surprise me that even simple questions like this one must be subject to research.
It solves several puzzles to assume consciousness isn't numerical, and I don't see any contradictions. Except now, perhaps?