Even though the shape of objects is always constant,
the change in angle when viewing an object can make it seem like the object has
a different shape; however, size constancy allows humans to perceive objects as
having a constant shape even if there are changes in the angle of perspective.
For example, in the first picture, the painting has
a rectangular shape, while in the second, picture, the angle that the painting
is viewed from causes it to have a more trapezoidal shape. Even though the
painting seems the shape of a trapezoid, humans still see it as rectangle due
to shape constancy.
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