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ILLUSIONS visual phenomena 

  "Stepping feet” Motion Illusion      strong, beautiful and (relatively) easy to understand

 Motion Induced Blindness   an illusion of disappearing dots


When you look at this picture close range you see Albert Einstein.



Now stand up and take several steps back, roughly 15 feet away,

It will become... Marilyn Monroe.





 Snake Illusion ad lib   with a new explanatory twist       

 Pinna-Brelstaff Illusion  

 Motion Aftereffect (Waterfall Illusion)  also known as »waterfall effect«

 Spiral after effect  more effective for some
 Reverse Spoke Illusion  something for the specialist

 Wagon-wheel effect  closely related to stroboscopic artifacts

 Stroboscopic Artefacts  making a teaching point out of a nuisance
 Sigma Motion  an optical illusion due to an interaction of image dynamics and eye movements

 Enigma by Isia Leviant


 Freezing Rotation Illusion  a "Best Illusion of the Year” winner 
 Reverse Phi Motion  something for the specialist

 "Stepping feet” Motion Illusion  radial version of »Stepping feet 1«, weaker

 Motion-Bounce Illusion   sound influencing perception of motion (crossmodally)
 Motion Binding  

 "Breathing Square” Illusion  


 Van der Helm’s "Kaleidoscope Motion”  

 Pikler-Ternus Display  


»Optical illusion« sounds pejorative, as if exposing a malfunction of the visual system. Rather, I view these phenomena as bringing out particular good adaptations of our visual system to standard viewing situations. These adaptations are »hard-wired« in our brains, and thus under some artificial manipulations can cause in­appropriate interpretations of the visual scene. As Purkinje put it: »Illusions of the senses tell us the truth about perception« (cited by Teuber 1960).

Before we delve in, I’d like to express my thanks to the many visitors who gave overwhelmingly positive @feedback, adding constructive advice on content and style ; please do keep it coming! [Or use the guest­book.] I have also been able to improve explanations when convincing scientific evidence was sent ;-). Yes, it does take sizable resources to set up and maintain this, but it is also very rewarding, bringing me into contact with so many charming people. Should you want to give back, simply link to this page or use the donation link ;-). Any advice is appreciated – and, yes, for a non-native speaker, English does represent sizable chal­lenges.


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Views: 23035 | Added by: nikhilr | Date: 2010-07-26 | Comments (38)