An illusion is a distortion of the senses, revealing how the brain normally organizes and interprets sensory stimulation. While illusions distort reality, they are generally shared by most people.Illusions may occur with more of the human senses than vision, but visual illusions, optical illusions, are the most well 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. Other illusions occur because of biological sensory structures within the human body or conditions outside of the body within one’s physical environment. Illusions are of namy types like Optiocal Illusion, Visual Illusion, Scary Illusion etc.