See the GREEN and BLUE swirls? Do you believe they are the EXACT same AQUA color?
I copied the area of GREEN swirl labelled as "1" and the area of BLUE swirl "2" and put expanded versions of each adjacent to each other so you can see they are really the EXACT same AQUA color.
OK, now that you know they are the same, look back at the swirls and you cannot make them not look GREEN and BLUE. Can you?
I think this is proof that, at least for color vision, we humans see things in a relative, contextual way rather than an absolute, isolated manner. A computer scanning the image pixel by pixel would have no trouble seeing the same color in both sets of swirls. However, we humans, even when we know for sure they are the same color, cannot dismiss the optical illusion.
Does this perhaps extend to other mental activities? Does it explain the contradictions in L-Mind and C-Mind thinking? L-Minds often willing to allow an otherwise normal unborn baby to be put to death at the whim of the mother while denying the justice system the legitimacy to use the death penalty on the most awful criminal? The C-Mind sometimes insisting that human life, once conceived, has an absolute right to live, while, at the same time, often supporting wars that kill large numbers of innocents as "collateral damage"?
PS: Thanks to my son-in-law Avi for bringing this illusion to my attention on his Blog.
PPS: [Added 10 July] Thanks to Joel for his Comment with a link to an equally compelling optical illusion. I went to Joel's link and downloaded the image. Then I copied part of the "A" GRAY square and part of the "B" WHITE-looking square and pasted them in the upper left corner so you can see they are exactly the same shade of gray!