Optical illusion

Another great optical illusion -- but does this still work if you are colorblind?

Any explanations why this works?
     Posted By: gdanea - Wed Nov 11, 2009
     Category: Magic and Illusions and Sleight of Hand

The eye can only see 16 "colors" at one time. To see more than that it has to receive a different "image". The brain then has to intemperate all these, almost, instantaneous, images into a coherent picture.
Posted by Expat47 in Athens, Greece on 11/11/09 at 11:29 PM
Yup, it's a contrast thing. The same illusion makes the shaded diamonds at the top of the following image look darker than the ones at the bottom. In fact all the diamonds are the same.

Posted by Dumbfounded on 11/12/09 at 10:31 AM
In this image all the grey bars are the same shade.

Posted by Dumbfounded on 11/12/09 at 10:51 AM
as has been pointed out close proximity of the shades allows us to pick up the slight contrast. but when separated the eye can't pick up slight differences. have you ever had a very dark blue pair of jeans? ones that look black unless you put them up against something black (or blue for that matter) then you can easily tell they are blue not black.
Posted by Patty in Ohio, USA on 11/12/09 at 02:07 PM
then you either have better eyes or a better computer monitor than me brian. 😊
Posted by Patty in Ohio, USA on 11/12/09 at 08:24 PM
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