Metaphysics is a branch of philosophy, and related to the natural sciences, like physics, psychology and the biology of the brain; and also to mysticism and religious and spiritual subjects. It is notoriously difficult to define, but for purposes of briefly introducing it to nonphilosophers, it can be identified as the study of any of the most fundamental concepts and beliefs about the basic nature of reality, on which many other concepts and beliefs rest -- concepts such as being, existence, universal, property, relation, causation, space, time, event, and many others.
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