In Delimitations John Sallis characterizes the end of metaphysics as a limit, or horizon, both enclosing metaphysical thought and opening the field of thinking beyond it. He elaborates five areas in which the boundaries of thinking are extended. Part I focuses on imagination as an opening power, enabling the task of thinking at the end of metaphysics. Part II presents the radicalizing of phenomenology's injunction to attend to the things themselves. Part III explores Heidegger's shift of thinking toward an opening or clearing. Part IV elaborates what Sallis calls archaic closure through a return to certain texts of Plato and Heraclitus. Part V, new with the second edition, confronts the nonidentity that takes place in the act of delimitation. This question is developed in relation to Husserl's project of a pure phenomenology, to the debate between hermeneutics and deconstruction, and to the secluding of ground announced in Schelling's thought.