The document provides an overview of how various artists, writers, philosophers, and intellectuals responded to and were influenced by World War I and the loss of meaning and certainty it created. It discusses how modernist art forms like Cubism, Surrealism, and abstract expressionism developed to capture disjointed and psychological perceptions of reality. Writers like Hemingway, Fitzgerald, and Eliot incorporated disillusionment and hopelessness into their works. Philosophies like Existentialism emerged to address the lack of universal meaning and importance of individual choice and responsibility. Music incorporated new rhythms and styles to express post-war uncertainty. Freud and Einstein significantly changed perceptions of the human mind and physical world.