Shape constancy states that objects regarded from different angles will produce different shapes on the retina. However, the viewer is able to recognize that the shape of the object in reality remains constant.
For example, if one views a soda can from different angles, the angles will produce different shapes onto the observer’s retinas. If one looks at the can from the side, it possesses a cylindrical shape. However, if viewed from above the can, it will possess a circular shape. Through the integration of the different perspectives, the viewer is able to understand that the top of the cylinder is circular due to shape constancy.
Another example is demonstrated through the
following photographs. In the first picture of Puck the dog, the viewer can see
that he is wearing a pumpkin costume and has floppy ears, but cannot see his
face. In the second picture, the viewer can see Puck’s face and a portion of
the pumpkin costume, though not all of it. Even though the pictures are taken
from different angles and produce different visions to the viewer’s eyes,
he/she is able to identify that the shape of Puck remains consistent.
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