English: Many philosophies and worldviews have a set of classical elements believed to reflect the simplest essential parts and principles of which anything consists or upon which the constitution and fundamental powers of anything are based. Most frequently, classical elements refer to ancient beliefs inspired by natural observation of the phases of matter. Historians trace the evolution of modern theory pertaining to the chemical elements, as well as chemical compounds and mixtures of natural substances to medieval, and Greek models. Many concepts once thought to be analogous, such as the Chinese Wu Xing, are now understood more figuratively.
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