Transcript Optical Illusions

Optical Illusions
Honors Geometry
How do optical illusions happen?
 Many of us have at least once come across
optical illusions in our lifetime. Beside being
fun to solve, optical illusions have the power
to puzzle and bewilder because we have an
implicit trust that what our senses tell us is
physical reality.
Do our the senses
(the brain)
lie?
 Illusions are a nice window into how the
brain works. It is surprising to find out that
the eye cannot see, it merely perceives
information which is passed down to the
brain where innumerable processes of
classification, comparison, and decisionmaking are initiated.
Keep your eyes on the dot. Is it in front, or in back of the cube?
Duck or rabbit?
Impossible Trident
Impossible Crate
Spirit Catcher
Keep your eyes on the lighter areas where the black lines intersect. You
should probably notice circles coming from the center of the design. The
trick is that a light color appears brighter when it contrasts against a darker
color. So, people see the areas adjacent to the intersections to be slightly
brighter, causing what appears to be circles.
The Bird
Queen Elizabeth II
Stare at the picture (on the left) for about 45
seconds. Then, stare at the white section of this
image (the right section). You should see the
Queen again. Keep your concentration, and for
those 45 seconds, don't take your eyes off the
picture.
Do you see the face?
Or an Eskimo?
Do you see a musician
or a girl's face?
Do you see an old man's face
or two lovers kissing?
Can you see the three faces?
Geometrical-Optical Illusions
http://www.sapdesignguild.org/resources/optical_illusions/index.html
http://www.sapdesignguild.org/resources/optical_illusions/index.html
http://www.michaelbach.de/ot/
https://www.brainbashers.com/opticalillusions.asp