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From an introductory Astronomy class.Moon size illusion, Optical Illusions, eye physiology and psychology
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The Moon Illusion• Effect: the moon APPEARS larger when near the
Horizon
• Effect: the moon APPEARS larger when near the Horizon
•Cause 1: Objects appear larger when seen in conjunction with a VANISHING POINT
The Moon Illusion
Cause 2• Our Mind tries to “flatten” the sky above
us, • So that we feel like the moon is closer
when above than on the horizon• Based on a lifetime of CLOUD
observations
•Cause 3: – Horizon has OBJECTS to
COMPARE to the moon’s size
The Moon Illusion
The visual environment can TRICK the Brain.
Ebbinghaus Illusion.
OPTICAL OPTICAL ILLUSIONSILLUSIONS
•TRICKS OF THE : LIGHT / EYE / MIND
TYPE 1TYPE 1•PROXIMITY Illusions–When seen in the right environment, size and direction can become mentally distorted
Müller-Lyer illusion
Hermann grid illusion
Scintillating grid illusion
Scintillating grid illusion
LateralInhibition-Your brain is trying to increase the CONTRAST of the image, and falsely concentrates the eyes, signals
café wall illusion
café wall illusion
Poggendorff Illusion – which color does the black line intersect?
White's Illusion – How many shades of grey here?
Cornsweet illusion
MACH Bands
VECTORIAL DOT CURVATURE ILLUSION
Zollner Illusion
NOW,READTHIS
“Forced Perspective” ToningGives illusion of movementMind interprets Dark=fartherLight = closer
Illusory Motion
Fra
ser S
pira
l
“FALSE BENDING”
If Straight Lines pass by an intensifying image,the brain will Either
“PUSH” the line out
Or “PULL” the line in
Jastrow Illusion – these are the same size
TYPE 2VISUAL IMPOSSIBILITES & FORCED PERSPECTIVE
The mind EXPECTS to see certain things, and objects can be drawn to Break those rules
• Front of the cube or Back of the cube?
Blivet
Ambihelix
TYPE 3•GESTALT / WHOLE PICTURE Illusions
•The mind can be focused on one image at a time, but recognize multiple images or composites.
Kanizsa Triangle
• Ready?...
Do you see a musician or a girl's face?
• Ready?...
• Ready?...
• Ready?...
old man's face or two lovers kissing?
• Ready?...
Old General orOld man and Young Mother at the Gate
• Ready?...
Buy a poster!
Don QuixoteNear and Far
• Ready?...
• Einstein or Marilyn?
“hybrid imaging.”
Looks like Ex-President Bill Clintonand his Vice President Al Gore, right?Wrong... It's Clinton's face twice, with two different haircuts.
How many Wolves do you see?
Scintillating grid illusion
EYE Physiology
Light receptors at the back of your eye absorb photons + Convert into brain signals.Rods – Basic Light receptorsCones – Color Differentiation.
Both dependant on blood flow/Distribution and translation of Image to electrical signal
EYE FUNCTION• Given prolonged exposure,
the eye tries to compensate to the same types of photons on the same cells.
EYE FUNCTION• Given prolonged exposure,
the eye tries to compensate to the same types of photons on the same cells.
BRAIN COMPENSATION
Your brain will get used to a pattern of movement,And adjust its perception so that movement is “stable.”When that pattern is removed, your brain will perceive stillnessAs moving
The Skin-Crawling Spiral
The Skin-Crawling Spiral
The Skin-Crawling Spiral
“DEPTH” Vision•“3-D” vision can determine what objects are near vs. far away.
•To do this, your brain takes the info from 2 eyes and compares the differences.
http://www.jedisimon.com/optical_illusions_by_jedi_simon.htm