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There is a famous parable in the Republic of Plato about a cave. In the cave is a row of people, chained in such a way that they can only face the back wall. Behind the row of people is a fire and a procession of figures walking by engaged in all the activities of life. The procession of figures casts shadows on the back wall of the cave. The people who are chained can see only the changing view of shadows, and because that is all they have ever seen, they take these shadows to be ultimate reality. Sometimes a person who is bound in this way, through great effort, manages to loosen the chains and turn around. He or she sees the fire and the procession and begins to understand that the shadows are not the reality, but merely a reflection on the wall. Perhaps with further effort that person is able to cut the chains completely and emerge into the sunlight, into freedom.
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