Answer: The main theme of Plato's Allegory of the Cave in the Republic is that human perception cannot derive true knowledge, and instead, real knowledge can only come via philosophical reasoning. In Plato's example, prisoners live their entire lives in a cave, only able to see shadows. To them, these shadows are reality.he shadows represent a false vision of the truth, an illusion about reality. Because the prisoners have never seen the true objects that exist in the world, the objects which are casting those shadows, they believe the shadows are all that is.
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