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September 16, 2005
Optical Illusion
The optical illusion I’ve chosen can be found on the web at: http://www.cs.toronto.edu/~roweis/images/optical-illusion-wheels-circles-rotating.png
I thought at first that the movement might be caused because of the colors in the wheels - I know that sets of colors stimulate our cones (color receptor cells) but I’ve since found another site that gives an explanation and also credits the originator of the “Rotating Snake,” Akiyoshi Kitaoka.
You can visit this site at: http://www.michaelbach.de/ot/mot_rotsnake/index.html
So I’ve learnt that illusory movement happens in relation to the movement of ones eye and is not caused by color but by the luminance of the segments of the circles. The direction of the apparent movement is determined by the order of the luminance. And the strength of the illusion is related to the luminance of the background.
Apparently, Gregory & Heard (1983), were the first to describe that asymmetric luminance steps cause illusory movement.
~ Nanette Savides
Posted by lcissavides at September 16, 2005 04:52 PM
Comments
A similar illusion (along with many other illusions of various types) can be found here: http://www.ebaumsworld.com/greenwave.html
This one operates off the same concept but requires the viewer to move their head: http://www.ebaumsworld.com/rippleeffect.html
Posted by: Amy at September 18, 2005 06:18 PM
My intial reaction to this visual illusion was "Ahhh, make it stop!" But I think it is really fascinating that our eyes will trick us into thinking the wheels are moving but they really are not. It also reminded me of writhing snakes even before I read the title.
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