" Illusions are a necessary consequence of intelligence. Cognition requires going beyond the information given, to make bets and therefore to risk errors. Would we be better off without visual illusions? We would in fact be worse off—like a person who never says anything to avoid making any mistakes. A system that makes no errors is not intelligent. "

― John Brockman , This Explains Everything: Deep, Beautiful, and Elegant Theories of How the World Works