In The Extravagant, Robert Baker explores the interplay between poetry and philosophy in the modern period, engaging a broad range of writers: Kant, Wordsworth, and Lyotard in a chapter on the sublime; Rimbaud, Nietzsche, and Bataille in a chapter on visionary quest; and Kierkegaard, Dickinson, Mallarme, and Derrida in a chapter on apocalyptic negativity. His guiding concern is to illuminate adventures of "extravagant" or "wandering" language that, from the romantic period on, both poets and philosophers have undertaken in opposition to the dominant social and discursive frames of a...