Even if there is only one type of thing 'x', our reality (which is, above all, dynamic) seems to require a relationship and interaction between 'x' and ' ~x'. I'd say, logically, reality needs at least two kinds of things.

Logic can only compel models.

You seem to be saying "Let x denote the universe. ~x is then a valid term. So ~x must denote something that isn't x, thus there are two things!" There are surface problems with this such as that x may not be of type boolean, and that you're just assuming every term denotes something. But the important problem is simpler: we can use logic to deduce things about our models, but logic doesn't touch reality itself (apart from the part of reality that is us).

What do you mean by "reality is dynamic"? Have you read Timeless Physics?