Eternal forms are the perfect, unchanging ideals or archetypes that exist in a non-physical realm according to Plato. These forms represent the true essence of all things and are more real than the physical objects we perceive, which are merely shadows or copies of these ideal forms. In this way, eternal forms help explain Plato's distinction between perception and reality, emphasizing that true knowledge comes from understanding these unchanging ideals rather than the fleeting physical world.
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