This book explores the
perception of the properties of
objects (such as size and shape),
their distance from us, and
their motion. It focuses on
problems such as are posed by
the achievement of constancy
of perceived object properties
despite an ever-changing
retinal image. Given the
similarity of the eye to a
camera, the mystery of our
perception is how we manage to
transcend the inadequate,
distortion-prone, ambiguous,
two-dimensional images
established on the retina and
achieve the rich, constant,
usually correct, three-
dimensional representation of
the world that we do. The book
also investigates cases in
which perception fails to
achieve correct
representation, namely,
illusion.