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Shape constancy, also known as form constancy is a form of perceptual constancy where a familiar object keeps its perceived shape despite major changes in retinal stimulation due to changes in its orientation.
An example would be a plate that would be recognised as such despite the fact that as you rotated it it would turn from having the shape of a circle, through various sizes of ellipse to a straight edge when viewed side on. As the view changes the stimulation on the retina changes, yet the object retains its integrity in perception.