Plato was a famous Greek philosopher born in 427 BC. He founded the Academy in Athens, one of the earliest known institutions of higher learning. His most famous work is The Republic, which uses the allegory of the cave to discuss the relationship between perception and reality. The allegory imagines people chained in a cave their whole lives, seeing only shadows on the cave wall from objects passing behind them. It explores what would happen if one of the prisoners was freed and brought to the outside world. Both The Republic and the allegory of the cave had significant influence on Western philosophy and political thought.