  By introducing the concept of poiesis, and by unearthing the presence of the phenomenon in traditional artisanship, Heidegger is suggesting that even though technological thinking was a possibility in pre-modern society, it was neither the only nor the dominant mode of bringing-forth. So what has changed? Heidegger argues that what is distinctive about enframing as an ordaining of destining is (i) that it “drives out every other possibility of revealing” (Question Concerning Technology 332), and (ii) that it covers up revealing as such (more precisely, covers up the concealing-unconcealing character of appropriation), thereby leaving us blind to the fact that technology is, in its essence, a clearing. For Heidegger, these dual features of enframing are intimately tied up with the idea of technology as metaphysics completing itself. He writes: “[a]s a form of truth [clearing] technology is grounded in the history of metaphysics, which is itself a distinctive and up to now the only perceptible phase of the history of Being” (Letter on Humanism 244). According to Heidegger, metaphysics conceives of Being as a being (for more on the reduction of Being to a being, see section 2.2.1 above). In so doing, metaphysics obscures the concealing-unconcealing dynamic of the essential unfolding of Being, a dynamic that provides the a priori condition for there to be beings. The history of metaphysics is thus equivalent to the history of Western philosophy in which Being as such is passed over, a history that, for Heidegger, culminates in the nihilistic forces of Nietzsche's eternally recurring will-to-power. The totalizing logic of metaphysics involves the view that there is a single clearing (whatever it may be) that constitutes reality. This renders thought insensitive to the fundamental structure of Being, in which any particular clearing is ontologically co-present with the unintelligible plenitude of alternative clearings, the mystery. With this totalizing logic in view, enframing might be thought of as the ordaining of destining that establishes the technological clearing as the one dominant picture, to the exclusion of all others. Hence technology is metaphysics completing itself.