So simple but so effective…..


Lots of people struggled to see the illusion yesterday, so I thought it would be good to have one that works for everyone…..


18 comments on “So simple but so effective…..

  1. Dan Simon says:

    An oldie but a goody. Mind boggling.

  2. What would it look like if you covered all three with a pencil each simultaneously?

    • Dave says:


      We must be told!

    • I did this quickly in paint by print screening the video (because I’m super lazy :P) and it almost looks like the paper is all the same, but you can see that the far one is slightly darker than the light. There is a bit of a continuum effect – it just appears to slightly get darker as you look across, but you can’t see any clear changes.

  3. Nearly works. The first two certainly look the same with the pencil there, but further to the right, and with concentration, the difference becomes apparent, particularly if you pause the video to give your eyes time to adjust. At first glance, there’s no difference so it’s effective enough. Clever illusion. As a professional artist, I’m trained to notice such things, so I suppose that’s why I made the effort to override the initial impression.

  4. fluffy says:

    That one’s a classic. What’s even more fun is to cover all THREE transitions and have your brain try to figure out how it is that all three pairs are “the same” even when the left and right are clearly different. For me, it resolves to the left two being a single lighter shade and the right two being a single darker shade.

  5. Greg says:

    “I thought it would be good to have one that works for everyone” *

    * Except colour blind people…they’re all the same shade to me, no pencil required.

  6. Neil says:

    I’m colour-blind and it worked for me.

  7. Drew says:

    No sound here at work, not sure whats going on?

  8. Lazy T says:

    Totally pointless, the pencil.
    Very good, the colour effect.

  9. ldymac says:

    I’m sorry,I just don’t see any illusion.

  10. Malky says:

    Moving the pencil makes no difference to me

  11. Matt says:

    I struggle to see all of these illusions as Youtube is filtered at my place of work. Please post for still picture illusions for those of us who for one reason or another can’t view videos? Please?

  12. @philstrphens says:

    Narrated by Bruce the Gay Guy from Family Guy!

  13. Mark says:

    Nice one – not seen that before.

  14. Anonymous says:

    How about creating a version of that sheet as a PDF (or something printable)?

  15. SimonP says:

    Was I the only one to see the gorilla in the background?

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