The Allegory of the Cave

Plato has Socrates describe a group of people who have lived chained to the wall of a cave all of their lives, facing a blank wall. The people watch shadows projected on the wall from objects passing in front of a fire behind them, and give names to these shadows. The shadows are the prisoners' reality.

Inspired by this theory, I believe that people's senses are always shaped by their own senses, the brain, and the environment around them. These feelings are like a cave created by themselves.