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By on March 12, 2006, with 29 Comments

Here’s another classic, known as the Muller-Lyer illusion. Which of the horizontal lines is longer?


Here is the same image, only bigger:

linillsion0pv300

  • keosha

    they are the same length only the arrow on the bottom one points out….smart huh

    • im cool like that

      they are the same length. it is the arrows at the end that make the bottom one look longer :D

  • Farted

    I have seen this illusion alot! They are both the same size!

  • sancho

    que putadas son esas they are the same

  • PSYCH

    Yeh this illusion is all about depth perception, the reason why one line looks shorter than the other is because our brains compare them to real life images (e.g. the corners of a room)

  • obvious

    obvious

  • Hai

    yawn

  • Al B

    Actually, they’re supposed to be further apart for the illusion to work!

  • jIN

    Your all sad

  • alana

    arent they tho?

  • guitarking

    For pretty much any illusion that asks, “which is larger?” the answer is, “they’re the same size.” This is a pretty popular one and I’ve seen it a lot.

  • Anonymous

    this one is popular but i neverget tired of it

  • i*is*awesome

    they’re the same i’ve seen this b4

  • Eva

    thats obvious!
    ther both the same length its just that cuz the arrow on the bottem one is pointing in a diiferent direction than the top one it looks longer…

  • Anonymous

    actually the first 1 is longer becuse it goes on forever since the arrows are pointing out

  • Anonymous

    there the same size.

  • Anonymous

    there both the same size.

  • fairybread88

    They are the same and its so easy cause its been around awhile and its in books to.

  • Anonymous

    BOTH ARE THE SAME STUPID PEOPLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • Anonymous

    you guys are all wrong. the top one is longer because, as the arrow indicates, it goes on forever
    DUH

  • Anonymous

    Well, TECHNICALLY, if you think about geomety and lines and line segments, the first one would be longer since it would go on forever. BUT, if you look close, they are actually the same size.

  • http://yahoo.com Alfrdo

    nope the top one is longer because the arrows indicate the top line is endless and the bottom stay yhe same

  • luca

    the upper one is longer

  • http://www.facebook.com/people/Kayla-Marshall/100001173732338 Kayla Marshall

    its the same!!!

  • Lydia

    This illusion is on MyMaths (which is a website where you can do online maths. We do it my school) ……
    Sorry for sounding a bit nerdy!

  • dfgdnfno

    same

  • idiotos

    the bottom one is longer than the top 1 u idiotos

  • idiotos

    the bottom one is longer than the top one u idiotos

  • http://www.opticalillusion.com idiotos

    bottom 1 is lon ger

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