 Stirner portrays this dialectic of individual growth as an analogue of historical development, and it is a tripartite account of the latter which structures the remainder of the book. Human history is reduced to successive epochs of realism (the ancient, or pre-Christian, world), idealism (the modern, or Christian, world), and egoism (the future world). Part One of The Ego and Its Own is devoted to the first two of these subjects (providing a negative critique of the past), whilst Part Two is concerned with the third of them (providing a positive account of the future).