Humans consider themselves unique, so they've rooted their whole theory of existence on their uniqueness. "One" is their unit of "measure" — but its not. All social systems we've put into place are a mere sketch: "one plus one equals two", that's all we've learned, but one plus one has never equaled two — there are in fact no numbers and no letters, we've codified our existence to bring it down to human size, to make it comprehensible, we've created a scale so we can forget its unfathomable scale.
