An illusion is a distortion of the senses, which can reveal how the mind normally organizes and interprets sensory stimulation. Although illusions distort the human perception of reality, they are generally shared by most people.
Illusions may occur with any of the human senses, but visual illusions are the best-known and understood. The emphasis on visual illusions occurs because vision often dominates the other senses.
Some illusions are based on general assumptions the brain makes during perception.
