From: Adrian Tymes (wingcat@pacbell.net)
Date: Tue Oct 29 2002 - 21:25:39 MST
ABlainey@aol.com wrote:
> Eliezer S. Yudkowsky wrote:
> > This is the most persistent optical illusion I have EVER encountered.
> >
> http://www.mayeticvillage.com/QuickPlace/project_green/Main.nsf/h_Index/6A2397B6F1B3DCB1C1256C4000357CE8/$FILE/image001.jpg?OpenElement&1033033489
>
> Amazing!
> I copied the pic into photoshop and cut out the two squares and
> put them side by side. I did find that if you put you hands, one either
> side of the squares. Shuttering out the cylinder and the left of the
> pic. The two squares do start to look different. this suggests that the
> illusion is an artefact of the entire picture. or maybe i'm just
> desperate to convince myself that the squares are different shades :o)
If you mean you just looked at the column on the picture containing the
two squares, you'd still have seen the shadow gradient. That's what
causes the illusion - shadows being so common in nature that our image
processing wetware automatically compensates for them.
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