The Allegory of the Cave appears in Plato's Republic and compares the effect of education and the lack of it on human nature. It is written as a dialogue between Plato's brother and Socrates, who tells of people that have been chained to the wall of a cave their whole lives. They see shadows projected on the wall from objects passing in front of a fire behind them. Socrates explains that the philosopher is like a prisoner who has escaped the cave and realizes that the shadows on the wall are not the true reality at all.