Hi there, Chris Manchon here with The Three Perceptual Constancies. The first one is size constancy which is the fact that the size of the object remains constant however the way the retina sees them varies with distance. For example if one person stood close and one afar, the closer one would look bigger than the one afar. The second one is brightness constancy which depends on how much light is present. For example the more light that is present the brighter a white sheet of paper looks. The last one is shape constancy which is the shape of a object depending on the distance from the object. For example a round plate may appear to have a more elliptical shape to it depending on the distance away from the plate.
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