Theory of Forms
Plato's metaphysical theory that abstract, perfect Forms are the true reality of which physical things are mere copies.
Also known as: Platonic Forms, Theory of Ideas, Doctrine of Forms, Platonic Idealism
Category: Philosophy & Wisdom
Tags: philosophies, plato, metaphysics, epistemology, abstractions
Explanation
The Theory of Forms is Plato's metaphysical doctrine that non-physical, eternal, and unchanging Forms (or Ideas) constitute the highest and most fundamental kind of reality. Physical objects and properties we perceive through the senses are imperfect copies or instantiations of these Forms. For Plato, a beautiful painting participates in the Form of Beauty; a just action participates in the Form of Justice; a circle drawn on paper imperfectly imitates the Form of the Circle. The Forms are: universal (one Form explains many particulars), eternal (they don't come into or go out of existence), unchanging (they aren't subject to flux), and intelligible (grasped by reason, not the senses). At the top of the hierarchy sits the Form of the Good, which gives all other Forms their intelligibility and value. The theory provides answers to several philosophical puzzles: why we can have certain knowledge despite a changing world, why diverse particulars share common properties, and how language and thought can refer to abstract qualities. It also raises famous problems, including Aristotle's 'Third Man' regress. The theory has shaped Western philosophy, theology (especially Christian Neoplatonism), mathematics, and even modern debates about abstract objects, universals, and mathematical Platonism.
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