The Truman Show closely parallels Plato's Allegory of the Cave. Initially, Truman is trapped in his own "cave"; a film set or fictional island known as Seahaven. Truman's journey or ascension into the real world and into knowledge is similar to that of Plato's cave dweller.
Truman, much like the prisoners in the cave, would know no difference then what they have been taught or shown to be the real world their whole lives. If Truman was taught in geography class that there was only Seahaven and the rest of the world was water, then he would accept that as the truth. However, because of some of the situations he encounters and sees, and with his curiosity and logic, Truman is able to work out something isn't right about the world and manages to escape. Because it is a gradual realization, Truman doesn't go mad as his make believe world unravels around him. As might be the case with Plato's cave dwellers, as they are stepping into the light of the real world.
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