The fact that you perceive the shape of a book as a book whether it is flat on a table, standing on its edge or held open is an example of

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Shape constancy refers to the ability to recognize an object as being the same shape regardless of its orientation or position. In this scenario, we are able to perceive a book as a book whether it is flat on a table, standing on its edge or held open, which is an example of shape constancy. Good continuation, size constancy, and size-distance variance are not relevant to this example.

The Fact That You Perceive the Shape of a Book