As we said at the beginning, “deconstruction” is the most famous of Derrida’s terms. He seems to have appropriated the term from Heidegger’s use of “destruction” in Being and Time. But we can get a general sense of what Derrida means with deconstruction by recalling Descartes’s First Meditation. There Descartes says that for a long time he has been making mistakes. The criticism of his former beliefs both mistaken and valid aims towards uncovering a “firm and permanent foundation.” The image of a foundation implies that the collection of his former beliefs resembles a building. In the First Meditation then, Descartes is in effect taking down this old building, “de-constructing” it. We have also seen how much Derrida is indebted to traditional transcendental philosophy which really starts here with Descartes’ search for a “firm and permanent foundation.” But with Derrida, we know now, the foundation is not a unified self but a divisible limit between myself and myself as an other (auto-affection as hetero-affection: “origin-heterogeneous”).