Existentialist literature is a genre that explores the meaning and purpose of human existence, often through the lens of individual experience and subjective perception. These books often delve into themes of freedom, choice, and responsibility, and may challenge traditional notions of morality and societal norms. Existentialist literature can be introspective and philosophical, and may offer readers a unique perspective on the human condition and the search for meaning in a complex and often chaotic world.

The category of "Civilization" in books encompasses works that explore the development, evolution, and impact of human societies and cultures throughout history. These books may cover topics such as politics, economics, religion, art, and technology, and may examine the rise and fall of civilizations, the interactions between different cultures, and the ways in which societies have shaped and been shaped by their environments. Overall, the category of "Civilization" offers a broad and fascinating perspective on the human experience and the complex forces that have shaped our world.

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