There are just a few basic themes: theory of the observer, theory of masks, theory of identity and identification, theory of hierarchy, theory of expression, to name a few. All of these belong to a more embracing theory of relationality. Take two terms and express their two-ness in some way and you already have three terms, the two and their two-ness. If there are two then they differ in some respect and what confirms or witnesses that respect is the third term. The subject, one possibility in this combinatory, is the identification of one of the two terms with the third, while the object is its exclusion. There cannot be a pure duality unless the two remain undistinguished and unrelated. If there were only yes and no they could not be told apart. If there were only two there would be no other. Once there is distinction there are three, and once there are three there are immediately many more, as each can play the role of the third in relation to the other two. "I, thou and it", "inside, outside and boundary", "past, future and present"; triplicity is latent within every term and explicit without it. As much as there is now a proliferation of positions there are also identifications. In writing down the equation, "A = B" you have already committed a triple, or is it now a quadruple, since there is a fourth for which the identification is? In addition, for every theory there is another theory which is its explicit denial.