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Checker Shadow Illusion.

By Alex in Everything Else on Feb 15, 2007 at 6:14 pm


MIT Professor of Vision Science Edward H. Adelson made this old (but neat) optical illusion: believe it or not, A and B are both the same color!

Link – via Say No to Crack


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  1. Solo
    Feb 15th, 2007 at 7:01 pm

    Saved it, loaded it in photoshop. Same color according to the picker. Yet, my brain cannot see them as the same color. Take a white brush, wipe out the surrounding around the 'lighter' tile. The more you wipe, the darker the tile becomes.

    How can anyone trust one's own brain after that.

  2. Ty
    Feb 15th, 2007 at 8:21 pm

    Yeah, this is one of very few optical illusions that I still can't force myself to see through. Good one.

  3. Crudely Wrott
    Feb 15th, 2007 at 11:16 pm

    See how easy it is to fool the human brain? No wonder they're having such a tussle in Kansas over teaching science!

  4. Kevin
    Feb 16th, 2007 at 12:13 am

    very impressive illusion

  5. johnson
    Feb 16th, 2007 at 12:48 am

    i blacked out surrounding squares here - http://i24.photobucket.com/albums/c41/john128/checker-shadow-illusion. jpg

  6. Alex
    Feb 16th, 2007 at 12:40 pm

    It's easier just to hold your fingers up to the monitor and block everything out except a small part of the two A & B squares. You'll see that they're the same color.

  7. Dave
    Feb 16th, 2007 at 1:35 pm

    Very tricky illusion there.

    See how easy it is to fool the human brain? No wonder they’re having such a tussle in Kansas over teaching science!

    Yeah. Some people just can't get over the fact that evolution is not and cannot be proven true. ;o) (how the hey did that topic come up?)

  8. Su
    Feb 16th, 2007 at 4:13 pm

    Brilliant - had to test myself before I believed it

  9. Raluca
    Feb 17th, 2007 at 5:49 am

    Unbelievable! I put it on my blog. Thanks Alex!

  10. johnson
    Feb 17th, 2007 at 1:03 pm

    dave was that religious babble?

  11. Jess
    Feb 18th, 2007 at 7:54 pm

    Yes come now Dave. Let's not get into another lame creationism vs evolution debate.

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