Like many German intellectuals, Hartmut Lange has long grappled with Heidegger. Positive Nihilism is the result of a lifetime of reading Being and Time and offers a series of reflections that are aphoristic, poetic, and (appropriately, considering his object of study) difficult. Lange begins with an abyss (There is an abyss of the finite. It is temporality) and proceeds almost immediately to extremity: The twentieth century was governed by psychopaths. They collapsed the boundaries of moral reason and refuted Kant's analysis of consciousness. He reflects further: But who shall punish whom? One man's virtue is another man's crime. Thus Hitler could feel unwaveringly, as he wiped out entire populations, the starry sky above him and the moral law within him, as stipulated by Kant. He considers the concept of civilization (misleading; how should one oppose the remedies of civilization to the egomania, the murderous appetites of such outright psychopaths as Stalin or Pol Pot?), the act of thinking (a fata morgana), the psyche, and Heidegger's Dasein. Positive Nihilism can be considered a pocket companion to Being and Time. Heidegger's understanding of Being is nihilistic, Lange writes, and then explains his assertion. He draws on Kant, Nietzsche, Kierkegaard, and Shakespeare's Othello for supporting arguments and illustrations.