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The Realms of Being is a series of five books written by the Spanish-American philosopher George Santayana. Published between 1927 and 1940, the series explores Santayana's philosophical system of naturalism, which he developed in response to the dominant idealist and pragmatic philosophies of his time. Santayana's work is characterized by its clarity, wit, and profound insights into the nature of reality, knowledge, and human experience.