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17. Exercise your visual brain with this optical illusion

checker shadow brain teaser

Which square (A or B) is dark­er?


Click here to dis­cov­er the answer and explore a sur­pris­ing phe­nom­e­non.


Next brain teas­er in Sharp­Brains’ top 25 series:

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12 Responses

  1. miss says:

    both same shade, i think

  2. Keith says:

    Yep They are the same. I had a hard time believ­ing it, but open the image in Adobe Pho­to­shop, and took a teardrop sam­ple from both squares. They are the exact same grey val­ue. 🙂 Weird..

  3. yahobahne says:

    A is a more dark­er grey than B

  4. yahobahne says:

    I went to the proof and expla­na­tion and I still don’t believe A&B are the same gray. I hold fast to my above com­ment. I just don’t get it.

  5. Guyguy says:

    Print the pic­ture and fold the page so the squares are togeth­er. You’ll see they are iden­ti­cal in shade

  6. Alvaro says:

    Guyguy, thanks for propos­ing a great way to find out!

  7. Aaron says:

    I think A is dark­er, B is a lighter col­or just shad­ed by the cylin­der, but A is a real­ly dark col­or.

  8. Anjani says:

    A is more dark­er grey in col­or than B

  9. hides says:

    wow, they are the same

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