As you hold a round plate in your hand and turn it from side to side,the image it casts on your retina changes.Yet you still perceive the plate to be round.This phenomenon can be explained by the principle of

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Quizplus · Accepted Answer

Shape constancy refers to the ability to perceive objects as maintaining their shape, despite changes in their orientation or image on the retina. In this case, even though the image of the plate on the retina is changing as it is turned, we still perceive it as a round object because of our brain's ability to maintain its shape constancy.

As You Hold a Round Plate in Your Hand and Turn