The turn of the nineteenth century marked a rich and exciting explosion of philosophical energy and talent. The enormity of the revolution set off in philosophy by Immanuel Kant was comparable, by Kant's own estimation, with the Copernican Revolution that ended the Middle Ages. The movement he set in motion, the fast-moving and often cantankerous dialectic of `German Idealism', inspired some of the most creative philosophers in modern times: including G.W.F. Hegel and Arthur Schopenhauer as well as those who reacted against Kant - Marx and Kierkegaard, for example.This volume traces the em