Poggendorff Optical Illusion

Hy everyone. For today I have prepared simple, yet amazing optical illusion (like I always do :) The Poggendorff Illusion is an optical illusion that involves brain’s perception of the interaction between diagonal lines and horizontal and vertical edges. It is named after Poggendorff, who discovered it in the drawing of Johann Karl Friedrich Zöllner, in which Zöllner showed the Zöllner illusion in 1860. In the picture to the left, a straight A and B line is obscured by a “track”. The A line appears, instead of the B line, to be the same as the C one, which is shown not to be the case. If you would like to check this for your selves, be sure to jump inside this article, and see the explanation example. I can’t beleive I missed posting this one, since it is so perfect optical illusion reperesentative.


62 Replies to “Poggendorff Optical Illusion”

  1. Haha, B looked to me like the one that’s connected to C, but I knew the illusion was it wasn’t what it looked like, so I thought it was A!

  2. I don’t see how this is special actually. I instantly saw that B was the right line.
    So I don’t think it’s that much of an illusion, more a test of a technical eye

  3. Oh woowwww… at first, i was thinking that the illusion was going to be just that the A line is the one that its connected to not the b line ‘like you would think’ … but it turns out its indeed the exact opposite! Heh, i like it, that’s nice :D

    It does look like it should be the A line! I think its as our mind thinks that the only reason the A one looks slightly off is because of the B one being there and ‘pushing’ it away slightly in our heads, so we take that into account and it looks like A connects with C …. But it doesn’t :)

  4. i dunt see how this is a really big illusion, ur brain tells u its A line and when u take out a ruler and actually extend the line its the B line.. preety simple

  5. i think these are really fooling, but they are so UNoriginal that they get kinda annoying. these are cool, but kinda boring, no offense.

  6. omg omg first comment.. woohooo

    please loser dont do this, as this is not a comment.

    good old classic optical illusion :)..
    but for some reason this one i can just see by eye that its the bottom one .. needs color.

  7. WOW, I am impressed with this one, yes I did think it should have been attached to line A but it is brilliant. x x

  8. Personally the first time I looked at it I thought that Line B was the one that connected all the way through, I suppose if I look at Line A a certain way it could appear like that but for my mind it just looks as though it was Line B…

  9. i like this one alot. its in a book i have somewhere (lol) but it alwasy gets me. keep up the good work! and thankyou for giving me something to look at when i first come on the computer :) my first port of call used to be an authors website, but now i come here first everyday!

  10. Nice work!! I have to confess that I fell into the trap, although my initial thought was that neither straight line could be correctly completed. After some soul-searching, I plumped for line A. Now I have seen the solution, it all seems very obvious… :-)

  11. If you’re good at maths, you should get this right. just look at the angles, the ones that are parallel will run along the right like.

  12. Actually, I see no optical illusion here at all. It appears to be to be exactly what it is. That is, the C line appears to be a continuation of the the B line and that’s what it is.

  13. where can i find Jesus on the cross and blends into the full face of Jesus. i saw it before, but can’t seem to locate it again.
    THANKS in advance. stretch

  14. I’m not good at Maths, (I never really was), my point is . . . I’m not even going to try to figure this one out. I will leave it to the experts in Maths.

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