How many hours have been spent staring with eyes crossed, trying to figure out illusions? Illusions are tricks played on your mind that causes a misleading impression of reality. Three types of illusions you have probably encountered at some point in your life: optical, riddles and magic tricks. Optical illusions are images that are deceptive. Some optical illusions make you trip, and others distort size, color, dimensions, figures (which are most of the video clips below).