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By on February 21, 2009, with 35 Comments

Now, I really love this one! Larry from Michigan sent me an image I couldn’t miss sharing with you. What we have here is a classic example of “Slanted Lines” illusion, just like the one we published on Monday. The usage of the effect is more advanced this time, since it additionally exploits the nature of the object presented. A seesaw (also known as a teeter-totter or teeter board) is a long, narrow board suspended in the middle. As one end goes up, the other one goes down. When we first see the example below, it looks logical that the right end went down due to heavy triangle positioned on it. The illusion shows just what you naturally expect, but the raw truth is that the seesaw is balanced perfectly horizontal, and doesn’t outweigh – nor left, nor right. You can easily prove this by squeezing your eyes, till you just see the outlines of the seesaw. Thanks for stumbling and sharing this!

Slanted Seesaw Optical Illusion

Update 1 (02/22/2009): Since yesterday, I have received this enhanced animation from visitor that goes by the name Mr. Anonym. His version might help you in seeing the effect little better. You should be able to spot the moment after which the seesaw gets slanted.

Slanted Seesaw Optical Illusion

Update 2 (02/22/2009): Alessandro aka SuperSandro sent another example where he modified this illusion. Now the seesaw is actually slanted, but appears perfectly balanced. Here is what Alessandro wrote – “Hi! Today I’m happy to send you this attached file. It’s the same as slanted Seesaw, but rotated for 4 degrees on the rectangle’s side. It seems to be horizontal, but of course it is not.”

Slanted Seesaw Optical Illusion


35 Responses
  1. IRainman says:

    and whether there is an article explaining why our brains perceive a picture like that?

  2. mati says:


  3. ojas pashankar says:

    This is my first ever comment!!

    Just wanted to thank you for such an Awsome collection.. keep up the Awsome work!!

    Obv, liked this illusion But I love all of them…

  4. Anonymous says:

    WOW thats awsome!!!!

    One of the best illusions ive seen in a long time!

  5. Anonymous says:

    Nice one, huh?
    I love it!

  6. Drummermean says:

    Owned my brain, that’s for sure.

  7. Andrew says:

    Yea, our brains do their best and most efficient way to perceive an image but sometimes, it’s not good enough. It’s tricky sometimes to figure out why that happened.

  8. FaQ says:


    IRainman, here’s a website I found that tries to explain away the mystery around the basic optical illusions you might have seen on this site and elsewhere.


  9. Anonymous says:

    wow thats cool…lol

  10. Smudge says:

    Great illusion!

    Our brains can be so stupid sometimes.

  11. Anonymous says:

    its weird how our minds do that

  12. Anonymous says:


    Second commenter!!!!

  13. Anonymous says:

    whoa this is cool a great effect

  14. Anonymous says:

    you dont need the downwards arrow on one end, but it helps.
    if you measure the distance, its perfectly flat. interesting

  15. ScrOuch says:

    This is really cool!
    It is always fascinating, how our brain is working.

  16. Optiguy says:

    I love this one! I usually don’t take much interest in the generic slanted line illusions, but this one is awesome!

  17. Tysss says:

    I see the third picture not balanced.. left part is more down.

  18. Anonymous says:

    A perfect example of the fact that things are not always what they seem!

  19. LPizzle says:


    thanks to larry of michigan, mr. anonym, and alessandro for helping make it even better!

    glad to see so much participation in your illusions vurdlak!

  20. Anonymous says:

    Sorry, but the last one doesn’t look straight to me. Good illusion though.

  21. Yum nub yum says:

    Great illusion, but I’m sorry to say the animated one is a fake. If you hide the whole animated picture except the top right triangle, you can see it moving whereas it shouldn’t.

  22. random says:

    also, try holding your pointer right at the line on the seesaw. You can see the line move below the mouse on the second picture

  23. Alice says:

    actually the one on the bottom isn’t very well-made. i see it as slightly slanted the other way.

  24. krokrow says:

    wow.. really great illusion

  25. notarealname says:

    woa is me or is the pictr comin closr

  26. peachyring says:


  27. james says:

    the animated gif fails, considering if you cover up the lines with your hand (ie the catalyst int he optical illusion part of things), you’ll notice the rise and fall of the triangle anyway. i’m sure it may be a proper illusion, but this gif fails in demonstrating that correctly.

  28. Phil says:

    This actually has some practical application. I am investigating why reading putts on a golf green is unreliable, and this is the best demonstration of why. Now, If I can only figure out how to use this on the course.

  29. Acolyte says:

    wow..Very nice

  30. Akire says:

    The last one is clearly slanted. It didn’t even cross my mind that it was supposed to look horizontal.

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