[Gathnet] Optical illusion of motion

[Moshe White]

Hi,

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

This is the best site I know.  It has explanations, but I never looked at 
them.  It also has other optical illusions (not of motion).  Some don't 
work, but some are really great.  It even has this warning:
"Caution: This page contains some works of "anomalous motion illusion", 
which might make sensitive observers dizzy or sick. Should you feel dizzy, 
you had better leave this page immediately."

Enjoy!
Moshe White


>From: SKM <eyedoc7kids at cox.net>
>To: Gathnet <gathnet at bmsi.com>, Barbara McClatchey <bclatch at mastnet.net>
>Subject: [Gathnet] Optical illusion of motion
>Date: Fri, 02 Jul 2004 04:31:18 -0700
>
>http://www.cs.toronto.edu/~moraes/illusion.html
>
>I do not know how it works, but I will bet that it is related in part to 
>the color of the ovals. If you think of this as a collection of segments 
>consisting of two ovals (blue and yellow) with a connecting black biconcave 
>lens, all the circles appear to rotate "away from yellow" and "towards the 
>blue". If you convert the picture to grayscale, the illusion is still 
>present but less strong. If you rotate the image 180 degrees, the blue and 
>yellow circles are on opposite sides, but the rules just mentioned apply. 
>If you make it a "negative" (inverting all colors) these rules still apply. 
>You can see this things yourself by saving the picture from your browser to 
>your desktop and then manipulating it with a utility such as Irfan view.
>
>There is an explanation that I do not understand at 
>http://psych.upenn.edu/backuslab/vss/vss2004/backus2004.html
>Scott
>
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