Wahl: I would also like to say that, when you [Lacan]speak of the subject and of the real, one is tempted, on first hearing, to consider the terms in themselves. But gradually one realizes that they are to be understood in their relation to one another, and that they have a topological definition – subject and real are to be situated on either side of the split, in the resistance of the phantasy. The real is, in a way, an experience of resistance.
Lacan: My discourse proceeds, in the following way: each term is sustained only in its topological relation with the others, and the subject of the cogito is treated in exactly the same way.
Lacan, Jacques. Book XI: The Four Fundamental Concepts of Psychoanalysis. Trans. Alan Sheridan. Ed. Jacques-Alain Miller. W.W. Norton & Company, New York. 1977. p. 89.