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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?

Muller Lyer Arrow Illusion

Here is the same image, only bigger:

Muller Lyer Arrow Illusion


29 Responses
  1. keosha says:

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

    • im cool like that says:

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

  2. Farted says:

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

  3. sancho says:

    que putadas son esas they are the same

  4. PSYCH says:

    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)

  5. obvious says:


  6. Al B says:

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

  7. jIN says:

    Your all sad

  8. alana says:

    arent they tho?

  9. guitarking says:

    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.

  10. Anonymous says:

    this one is popular but i neverget tired of it

  11. i*is*awesome says:

    they’re the same i’ve seen this b4

  12. Eva says:

    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…

  13. Anonymous says:

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

  14. Anonymous says:

    there the same size.

  15. Anonymous says:

    there both the same size.

  16. fairybread88 says:

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

  17. Anonymous says:

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

  18. Anonymous says:

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

  19. Anonymous says:

    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.

  20. Alfrdo says:

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

  21. luca says:

    the upper one is longer

  22. Lydia says:

    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!

  23. idiotos says:

    the bottom one is longer than the top 1 u idiotos

  24. idiotos says:

    the bottom one is longer than the top one u idiotos

  25. idiotos says:

    bottom 1 is lon ger

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