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By on April 13, 2006, with 19 Comments

One of our faithfull visitors, Leo Sakari submitted this awesome optical illusion. We had simmilar ones in the past, like: “Two Monoliths”, “Flowers”, “2 Arrows”, “Lines in a street”, “Soldiers”, “Lines no.2”… but in a way, I think this one shows you the best how your eyes & brain can decive you! This is the description of following illusion: “The black (bold) line in the back seems much longer than the one in the front because your brain assumes it is seeing the effect of perspective. When the background is removed, the lines are seen to be equal”.

  • Farted

    I don’t get it.

    • Kaleb

      i measurd the width and the last bold line is the widest. this isnt an illusion

  • iaui

    The two dark lines are the same length.

  • Farted

    Ohhhhhhhh…………. the two DARK lines, I thought it was the two lines, not dark! I’m dumb!!

  • Hai

    wow yawn

  • Anonymous

    WTF!! The bold of the left corner and the bold line of the middle-inner corner are the same! Nice one!

  • person 1


  • Gordo

    Pretty trippy!
    I had to get out the ruler to make sure they are the same size, I still find it pretty hard to believe just by looking at it that they are.

  • Anonymous

    ?Huh? Me dont geddit.

  • Jack


    • fossda

      its not scary!!!!

  • Anonymous

    wow i can see that!!!

  • Anonymous

    sorry, but i cant get it…..

  • Anonymous

    are u stupid?? the two BOLD lines are of equal length, try to think 2D for once.

  • rare_piece

    It is too because there is a small change in the two angles, they are not paralell to each other. It is really hard to see though.

  • lisa

    this very cool… simple but it caught me!

  • kat

    anyone struggling with this illusion should measure the length of both bold line with thumb an fore finger…they are exactly the same size!!!!

  • Nathan Beam


  • NASAfan

    The perspective lines trick your brain into thinking that this is a real world 3d image and uses this to force your mind to calculate that the line on the right is further away and therefore longer. This is componded by the trapezoid tiles that coerce you to think that the left hand line is nearest and three times smaller than the one on the right. Its a great illusion and shows how our ‘common sense’ can be easily fooled. Similar to the classic Muller Lyre illusion. Well done!