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Geometrical Illusions: Size
The
Jastrow illusion
(page 85) was described by psychologist Joseph Jastrow in 1891. The two
shaded areas are identical in size and shape, but most people perceive the top one to be smaller. The
Ebbinghaus
(or
Titchener
)
illusion
(page 137) was described by psychologist Hermann Ebbinghaus
in 1897. The two central circles are the same size, but most people perceive the one on the right to
be smaller.
The
Shepard illusion
(page 93) is based on a 1990 drawing by Stanford psychologist Roger Shepard
[Shepard90]
. The two tabletops are the same size and shape, but perspective cues make them look
very different. Shepard first demonstrated the effect in 1981.
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