In The Republic, Plato imagines human beings chained for the duration of their lives in an underground cave, knowing nothing but darkness. Their gaze is confined to the cave wall, upon which shadows of the world are thrown. They believe these flickering shadows are reality. If, Plato writes, one of these prisoners is freed and brought into the sunlight, he sill suffer great pain. Blinded by the glare, he is unable to seeing anything and longs for the familiar darkness. But eventually his eyes adjust to the light. The illusion of the tiny shadows is obliterated. He confronts the immensity, chaos, and confusion of reality. The world is no longer drawn in simple silhouettes. But he is despised when he returns to the cave. He is unable to see in the dark as he used to. Those who never left the cave ridicule him and swear never to go into the light lest they be blinded as well.