Perceptual Constancy: Perceptual constancy is the tendency to perceive objects as having stable properties such as size, shape, and color despite changes in sensory input.
Visual Illusion: Visual illusions are misinterpretations or distortions of real-world stimuli that can result in perceiving something differently than it actually is.
Figure-Ground Relationship: The figure-ground relationship refers to our ability to distinguish between an object (figure) and its surrounding background (ground).