The story explores the idea that "the world is what you perceive." If your mind is chaotic, your reality becomes chaotic.
The series is famous for its system, where the player/viewer chooses between positive or negative delusions, directly affecting Noah’s mental state and the eventual outcome of the story.
In the series, this is a secret conspiracy involving a device designed to manipulate the collective senses of the population, effectively turning human minds into "heads of chaos."