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By on December 9, 2010, with 217 Comments

Update: The solution has been posted, you can see the answer by clicking on the original picture!

I can imagine you had enough of all them Ebbinghaus illusions by now, but I promise this the last time! Just wanted to see if all my submissions regarding this topic had any weight, and if the experience you gained helps your brain in processing these kind of tests better. So, which of the surrounding circles labeled 1-8 is the same size as the circle in the middle of the image? Solution will be posted shortly…

Lets Test Your Skills!

To see the answer, click on the picture above!


217 Responses
  1. James Smith says:

    I was close.. I picked 4, but in fact, it’s 3.

  2. Mark P says:

    I’m gonna go with #4

  3. Tom says:

    All of them!

  4. Kopy says:

    At first I thought this was just like every other illusion where all the surrounding circles would be the same size but then I looked a bit closer. My conclusion is that either circle 3 is the same size as the center circle or neither of them are. But 3 seems to be the closest.

  5. hishabi says:

    number 5?

  6. breandan says:

    At a guess…7. 8 looks too small.

  7. Barbarella says:

    I was going to say all of them but that’s obviously not true. I can’t pick between 3, 4, 5, or 6 and I figure that’s the illusion. There must be more than one. I’ll wait for the solution rather than get out my ruler.

    • curious says:

      they are not all the same. i didnt measure with a ruler, but i can tell that they are different sizes, if if it is by one millimeter or so.

  8. Elliot says:

    3…or 4…no 3. definitely 3

  9. sharon says:

    excellent but there actually is no difference

  10. aelveon says:

    [spoiler alert] all of them! I hope

  11. K4ozz says:

    Number 4!!!

  12. Snowman25 says:

    I’d say, it’s number 5

  13. Honey says:

    i thought no.5 at first, but it is no.4 ;)))


  14. Poppy says:

    I’m going to go for 3.
    Because it’s a good number, and
    it’s only because I know that it is going to be one of the ones that looks huge, because the illusion is amazing :D

  15. Kaleb Trøy says:

    All of them are the same size.

    • Rosina says:

      I checked all of their sizes in Gimp, and they are all different sizes. Number 1 is the only one that is the same size as the circle in the middle.
      Circles 1-8 get progressively smaller.

      I guessed number 3. XD

    • Rosina says:

      Ooops! I lied. :( I rechecked and #3 is the correct circle

  16. asdasd says:

    I think it´s number two

  17. Synco says:

    When I tried it by just looking at the illusion, my brains would say number 5 is the same size as the circle in the middle.

    Since I do not trust my eyes (and brains), because it is an illusion I magnified the picture and took a ruler to measure the diameter. By doing this I found out that cirle 3 has the same size as the circle in the middle.

  18. Zade says:

    Crossing my eyes to cheat I think 6 is the same size

  19. Dave says:

    My eyes want me to answer seven or eight but if I cheat and sort of measure, it looks like number four. Interesting.

  20. Pygormus says:

    All of them!

  21. Lizzie says:

    I bet they are all the same size! :O

  22. Care Bear says:

    Try to imagine how little I care.

  23. kcannarozzi says:

    They are all the same size. It is the size and location of the rings of smaller circles in relation to the center that makes the center circles appear to be of different sizes.

    • Rulers Rule says:

      A ruler quickly disproves the “all” theory. Only #3 is exactly the same size – Don’t guess. Know. Otherwise you look either r-e-a-l-l-y lazy or r-e-a-l-l-y dumb…

    • kcannarozzi says:

      There is no need to be insulting. My understanding was that we were meant to GUESS and the solution would be provided later. Measuring and optical illusion defeats the purpose and spoils the fun. I am also surprised that you singled me out for my guess when many others guessed the same way. Let’s please try to keep this light-hearted and fun, and not mock others for their posts.

  24. sinirgi says:

    There not all the same size… I knew that clear ruler I bought would come in handy sooner or later. Still unsure about the correct answer though. 4 maybe

  25. Bulasty says:

    number 5 isn`t it?

  26. Michael says:

    Reverse Illusion :)

    Taking it into an image editor shows that the circle created by the surround dots are all the same size, but the size of the middle circle changes.

    The correct answer is 3. The diameter of the circle is 49×49 pixels, matching the center. (number 4 is 47×47 pixels).

  27. nadia says:


    • vintz72 says:

      Nadia, YOU need some medecine I guess.
      Mesuring the circles (with either a good Photoshop or a ruler) shows that the #3 is the only one that matches the size of the center one.
      However, considering only my eyes, I should have said #7 !

    • Beck Ford says:

      Awesome illusion Vurdlak, I really like this one.
      Caps are always unnecessary, especially when what you have written, using the caps, is incorrect, especially when what you have written is aggressive and judgmental. I say, logic says, optics says, and brains say: the outer circles are *all* different; number 3, yes: three, is in fact the only circle that has the same circumference as the centre circle.
      Ive had my eyes checked, I have perfect 20/20 vision. This isn’t about how good people vision is: this is an *optical illusion* website, please don’t forget that “illusions” are interpreted differently by individuals hence the illusory qualities of these images.

    • Amanda says:

      haha. so, either the people who used a magnifying glass, ruler, and multiple picture programs got it right, or you did… i’m thinkin them, stupid. ahhah(:

  28. josephine says:

    5 or 6? or all because these illusions keep popping up

  29. Mik says:

    all of them are the same size

  30. Jessie says:

    They’re all the same size.

  31. Enlay says:

    Number 3, but i discovered it with photoshop :C …

  32. TB says:

    I thought 6, but measured and found it was 3. Interesting how many people claim they KNOW the answer when they obviously have not actually checked.

  33. tito says:

    it’s a good illusion but # 3 is the answer

  34. AlreadyTriedTheForce says:

    All, tried measuring with my fingers…

  35. schnallity says:

    They’re actually all squares.

  36. tj says:

    it’s all of them

  37. me says:

    3 i cheated and used paint to crop them over

  38. glp says:

    for once its not an everything is the same size illusion, there actually is a true winner. That winner is #3. I d o financial analysis for a living and couldnt bare to not do some analyzing on this one myself. I can assure you #3 is the same size. Just take some time to copy the circle in the middle, and compare it to the outer circles, max zoom, and #3 is almost a perfect fit.

  39. Loso says:

    They’re all the same size.

  40. Typeaux says:

    I measured. #3 is the match. I’m with some of the others and thought it was #4 or #5, but those are just a tad too small.

  41. Cherry Blossom says:

    Tee Hee. I measured it, and i’m pretty sure it’s number 6.

  42. hs says:

    measure the screen it is 3.

  43. mehreen hasnain says:

    they are all of the same size.its only the placement of smaller circles around the circles 1-8,which is making them look different in size.

  44. George says:

    They are all the same size… Not that I measured them it’s just that the little dots around the circles shrink in collective diameter making the larger circles look bigger or smaller than they really are… I think.

  45. Moonchild says:

    Michael is correct, it’s 3. I immediatly thought all of them too but photoshop says 3. 49pixels just like mickael said. Sorry to everyone who thought it was a trick question (inc. me!).

  46. arch28806 says:

    they’re all the same just the little circels are more sped out in each number

  47. codie says:

    They ARE all the same size. That’s why it’s an optical illusion.

  48. Someone says:

    All of them!

  49. Jim Costner says:

    Nice! It took a minute with cut, copy and paste to prove it, but circle #3 is the only one that is the exact same.

  50. Miky Dallaire says:

    They all are! :-)

  51. chris says:

    its 3.just measure it with a ruler on your screen

  52. Henk Smit says:


  53. Ariel says:

    4…….no no, all of them.

  54. PixelsGarden1 says:

    Well, I’m probably way wrong, but I say all of them are the same as the middle, 1-8 inclusive.

  55. Selma Cahtarevic says:

    all of them ? XD

  56. lhai says:

    it’s number 5

  57. Jakob Lahn Christensen says:

    number 4 i think

  58. catzrules says:

    all of them are the same as the one in the middle!

  59. justin says:

    i’m goin with 4

  60. suzlyn says:

    It’s 3 or 4, I’ll go with 3!

  61. TumTumTamatem says:

    U think all of them are the same size… or very very close in size.

  62. shannonihan says:


  63. Xheia says:

    This would still be hard without the surrounding circles, I think.

  64. Gregory Padilla says:

    By eye I thought it was 5. Then I measured with my mouse cursor and thought it was 4. Then I see the cut and paste evidence and know it’s 3.

  65. lb says:

    What the hell is an optomrist?

  66. plmethvin says:

    3, 4, and 5. Mainly 3.

  67. TM says:

    Nardia, I wont be going to your eye specialist?

  68. TM says:

    If its the surrounding circles surrounding the surrounding circles, then it is none?

  69. Cameron says:

    All same size. Too easy.

  70. anon. says:

    I think it’s 6.

  71. Bjarmi says:

    number 2 is right

  72. kimbo says:

    number 4

  73. Claire says:

    Awesome, it took me a bit, but paint is my friend. 3 is the same size, though first glance it looks like 8 is.

  74. preson says:

    actually i think 6

  75. Indigo May Roe says:


  76. Sean says:

    I think its 2!

  77. Markus says:

    I think its the number 1

  78. Dathomir says:

    All the same…

  79. Illusionist says:

    The answer is 3, before posting bullshit (all the same) verify in a image editor, at least you won’t make a fool of yourself :)

  80. I had to check, but it’s definitely No.3! If you click and hold the image you can drag a ghosted version of it around to make sure! Well, you can on a Mac in Firefox, anyway!

  81. Joey Tillman says:

    they are not all the same size. not even close. put your mouse inside #1 and then #8.

  82. Den says:

    how can they all be the same? LOOK AT #8 AND #1! yeah i know the little circles make it look wierd, but if you measure they’re still different sizes!

  83. try to use MS powerpoint (2007 or higher)

    paste the image in the middle of your slide.

    then hold Alt and drag the image, an afterimage will appear, it is perfect for measuring. number 3,4 and 5 are the only ones capable of being the same, but 3 really seems to be the perfect clone

  84. Tama2d2 says:

    Solution: number 3

  85. benua says:

    The same : i thought all of them would fit, but in fact Photoshop says only the number 3…

  86. Kimon says:

    I was gonna say all of them but clearly 1 and 8 are nowhere near the same.

  87. Suri says:

    The circles get smaller going from 1 to 8 and 3 matches the size of the middle circle

  88. Mars says:

    it cant be all of them. I counted the smaller circles that make up the rings, and they are all the same number in each. So the circles inside them get gradually smaller.
    I reckon its either none of them – which is just silly – or three.

  89. Sagamore says:

    On my screen they are all the same size as a dime. so they are all the same size. I mean you know this illusion, so they should all be the same, and in fact are.

  90. luke says:

    to all the people who said there the same – get ur ruler out. !!! its easy to see there not the same.

  91. doris says:

    Number 1!

  92. Beekle says:

    Definitely No 3. How anyone can say they are all the same mystifies me!

  93. Parsonrob says:

    Whoever said # 3 is correct! I measured them too, with a ruler.

  94. r says:

    i think they are all the same size

  95. Bulle48 says:

    They are NOT all the same size. The tiny circles which go around each # are the same, so the circles in the middle of them are all different decreasing in size as the number increases (#1=largest, #8=smallest)

    I think the answer is #1.
    The small circles around #1 make it look large in contrast to the center image where the center circle is surrounded by larger circles to make it look smaller.

  96. Monxy says:

    It is 3. I have checked with GIMP, I am sure. Not all of them are the same sizes. I repeat, it is number 3, I am 100% sure of it.

  97. Kairho says:

    Well, they cannot be the same size; a quick ruler measurement shows #1 and #8 are quite different.

  98. Samantha Shireman says:

    Oh my goodness, just measure them folks, they are obviously not all the same. My guess is 3. It’s difficult to measure precisely but with a rough finger measurement you can tell 1 and 8 are different, at least.

  99. Victoria says:

    Number 4 is definitely the one!

  100. earthling says:

    The answer is three.
    It should be fairly obvious that it is not all of them, because one thing that IS constant is the size and spacing of the outer rings of twelve little circles.

  101. NeeL says:

    Im gonna go for 6.

  102. uncle sam says:

    Hi nadia, wanna date?

  103. Jeff says:

    Well, measuring with a ruler will reveal that they are not all the same size. It’s a close call between 2 and 3, but I am going to say 2.

  104. BrainStorm_wf says:

    Cant believe some people says all are the same, when if you see picture 1 & 8 close, is obvious they are different sizes.

    I tough at first time that the correct size are 4 or 5, but i’ve checked and is #3.

    Good one :D

  105. jim says:

    You are all so used to saying ALL that you didn’t take the time to measure. Fact is Fact by measure only #4 only.

  106. Kelly Pennington says:

    i think it is number 8…

  107. Kairho says:

    Duh … my previous should read “they all cannot…”

  108. Mark says:

    There are 4 lights!

  109. steve says:

    all of em

  110. Cara says:

    Number 3 is exactly the same size as the center circle.

  111. mikie m says:

    anybody that actually chose a numbered circle over another numbered cicle is a moron

  112. Bruno Issao says:

    You can clearly see they aren’t all the same size…

  113. honey says:

    I think its 3

  114. Karen says:

    only 3 is the same size and the central cirlce

  115. Ronald says:

    I think they are all the same size

  116. Snowy says:

    And you, Nadia, need to check your spelling and your manners. Pff –’

  117. ebbhyen says:

    I have a Mac. I took the Grab program and selected 1/2 the inner circle. After the picture came up, I lined it up with itself and it was a perfect fit. Then to the outer circles: ONLY #3 was a correct fit.

  118. Mars says:

    i did go to the extreme and put this onto paint, and tried them all out. The dimensions are such that three is the best fit, none of them are quite exact, and this is not really an illusion.

  119. Austin says:

    its three. i know its three. the answer will say three. if you didnt say three, youre WRONG. if you did, youre correct. its three, its three,just believe me, its three.

  120. Neesa says:

    3, i measured them, it’s 12mm in diameter :P

  121. Noel Kinkela says:

    4 and 6

  122. plmethvin says:

    Oh wait, yeah I see it. It’s 3. And that Nadia person up yonder istheonethat needs to go seeth optomotrist nearest to her. ANYONE CAN SEE THAT #8 LOOKS NOTHING LIKE #1.

  123. Rachel says:

    Sorry the correct answer is definitely not all of them. The center circle definitely matches number 3 and nearly matches 4 but not precisely. I used adobe photoshop to check.

  124. Richard Haviland says:

    I wanted to measure each one, but didn’t. My guess is number 3.

  125. Hink says:

    how come the dude aint posted the answer yet?

  126. ricky says:


    just kidding
    I think all of em are the same.
    Note that I said I think

  127. Joan says:

    I believe they all are the same size

  128. A Snail says:

    I suspected they where all the same initially but soon descided that was wrong. Next I went for 4 initially, but on closer inspection 3 is the one. I would have thought changing the size of the big circles would also have made this one harder/more confusing and changing the diameter of the circle of small circles around the numbered circle, or perhaps they where left all the same knowing we would suspect a trick like that :)

  129. angel says:

    i choose 3

  130. Isabel says:

    They are all the same size. if they werent, why would this be called an illusion???

  131. somebody says:

    Itz number 3 cos if u really look 4,5,6,7,8 are too small and 1 and 2 are too big. + i no its one of the big ones cos its a good illusion.

  132. Voigt says:

    Bye eye only, #5.

  133. debbie says:

    just ‘cos no one else said it I’ll go for no. 1

  134. phil says:

    either 3 or 4 (I have bad eyesight) so I’ll go for (flips a coin) no. 3

  135. tevor says:

    its number 6

  136. Sarah-Jane says:

    I think it’s either 3 or 4….
    probably 3!!!

  137. ZL123 says:

    At first I thought it was all of them but it in fact is 3 :)

  138. GAURAV says:

    the circles appear to be reducing in dia from 1 to 8.
    can’t decide between 3 or 4 , could be the illusion or that the differences between them are too small .
    will wait for respone rather than measure

  139. pricess says:

    well, i think its circle number eat
    but they really look very confusing at first…
    but still now i guess.

  140. melpoe says:

    it is one, i measured

  141. melpoe says:

    it is one, i measured it.

  142. ahmedsaad says:

    its no. 3. i measered it with a ruler

  143. PixelsGarden1 says:

    ‘Solution will be posted shortly…’

    To quote the Moody Blues…”Can I ever get an answer….”

    I still think they are all the same…

  144. agirl says:

    really? its clearly 6

  145. Chad says:

    I think they all are the same. I just think the lil circles around the circles are moving away from the circle.

  146. Paul Schilling says:

    Same as ZL123! At first glance they all look pretty equal; however, once any of them either get larger or smaller then #3 is the only precise one! Good one!!

    Also Congrats on getting to Yahoo’s! homepage!

  147. Ashkenazi says:

    1st one I believe…

  148. vimeospot.com says:

    nice pics on the illusions.

  149. April says:

    wut am i lukn at?
    im lost. wut do i have 2u guess?

  150. Madison Jacques says:

    To see the answer click on the pic. BTW its #3

  151. Iris says:

    I honestly don’t see how it can be 3. Even in the solution, 3 is bigger.

  152. Emily says:

    They arent the same size, i measured XP (im not that sad dont worry)

  153. Oly says:

    They’re all the same size. The trick is that the smaller dots surrounding them gradually move farther away from the dots to make them appear smaller than the center dot. Look again.

  154. alice says:

    you know, if you have been on this website long, you’d soon realise it’s an illusion- meaning it can’t be six because it looks like it- it’s one or two.

  155. ALFONSO says:


  156. Jon says:

    Tis 3 after many minutes of staring. Almost picked 4.

  157. Jon says:

    Tis 3 after many minutes of staring. Almost picked 4. And they arent the same size.

  158. STRETCH97 says:


  159. ysganagadhar says:

    this is very wonderfull

  160. TheRhyslightning says:

    I think they are all the same size just an optical illusion that they look like they are getting smaller but they are all the same size so they are all the same size as the circle in the middle.

  161. Aaryash Nayak says:

    its 1

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