Illusions: Illusions are perceptual experiences that do not match the physical reality of an object or stimulus. They often involve misperceiving size, shape, motion, or color.
Visual system: The visual system includes all parts of the eye and brain involved in processing visual information. It plays a crucial role in perceiving size accurately.
Optic nerve: The optic nerve is a bundle of nerve fibers that carries visual information from the retina to the brain. It transmits signals related to size, shape, and color perception.