Two INSANE optical illusions
Discussion
Your eyes see colors and shades relative to each other, so reds and blues still look that way, compared to one another, if they are both subject to the same over-cast. Under white light, one color, relatively blue in a yellow over-cast, can the same as the one that is relatively yellow in a blue over-cast. But I took a piece of paper with holes in it and held it over the blue and yellow x, and on my monitor, one (the "yellow") was still much lighter than the other.
This is clever stuff and illustrates how the brain filters and enhances the actual images we see so we can make sense of the world around us.
We do the same trick with sound and especially music. This is why audiophiles end up listing to their equipment and not the music they are playing.
Human Beings are BRILLIANT. 
sccbishop said:What did you do to the 2nd one?
I have checked these in photoshop and it's correct!
I removed the yellow and blue which was over the 2 objects but it did nothing....
And the 1st one I've seen before but for those who can't be bothered, I dragged both tiles onto the white....
The first one is definitely correct, the two squares A and B both have RGB values of 6b6b6b. The second one is so screwed by artefacts it'd be a job to say what one colour they are:
It's for this sort of reason that photos taken under artificial light look either brown or green but the room looked normal when you took it.
It's for this sort of reason that photos taken under artificial light look either brown or green but the room looked normal when you took it.
then 
More here
[url]www.ritsumei.ac.jp/kic/~akitaoka/index-e.html[/url]
I have read an explanation for the first picture before, and I'm trying to find it now.
[url]www.ritsumei.ac.jp/kic/~akitaoka/index-e.html[/url]
I have read an explanation for the first picture before, and I'm trying to find it now.
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