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By on January 4, 2014, with 85 Comments

Are you guys and gals out there ready for yet another brain teaser optical illusion? I know you all absolutely love these types of optical illusions, which is why I’ve started to focus more on posting brain teasers up for all of you out there. This brain teaser is one of those ones that are definitely going to mess with your mind. I would suggest reading over the paragraph first of all and then counting up all the F’s that can be found in the paragraph. However, it’s completely up to you. Either way, you should only count the F’s you find one time and then post your results in the comment section below this post. Now, I present you with this letter counting optical illusion.

How Many F Optical Illusion

© Gianni A. Sarcone, www.archimedes-lab.org. All rights reserved.

So, now that you’ve read over the image above, how many F’s were you able to count in the text? You should leave your answer below in the comments section and let us know what you came up with. I bet we will see a bunch of different answers. If you liked this optical illusion, you should let us know by leaving a rating. Also, don’t forget to share this with your friends and see if you can stump them, as well.

  • try

    10

  • jeffj

    9

  • Betty Killbuck

    I counted six Fs.

  • Jason

    10

  • Renaagade

    9

  • Dian

    I counted 8. My strategy was to read the paragraph backwards.

  • Gail

    10

  • Gabriel

    2 Fs?

  • Roofiss

    I count 8 of them.

  • Roofiss

    No, there are 10.

  • kuruvachan

    7

  • john forester

    i’m guessing 10; some words are repeated.

  • Michael Jones

    uhmmm…4?

  • merrick

    I got nine.

  • .mau.

    how should I count the two cases of “of of” of which the text is peppered?

  • Rodrigo Lustosa

    i found 10 Fs!

  • Howard Brazee

    I counted 10, and only after noticed that the illusion wasn’t really about the number of F’s, but in the fact that we didn’t notice repeated OF’s.

  • http://wish.issysworld.com chuck

    I count 9.

  • Markus B.

    8?

  • Lawrence Grace

    There are “9″ F’s.

  • Michael Johne

    10

  • SAIFULLAH JADOON

    there are seven 7 in the paragraph

  • SAIFULLAH JADOON

    there are seven F in the paragraph

  • SAIFULLAH JADOON

    there are nine F in the paragraph

  • http://twoopy.com scott

    10

  • bross

    10

  • SAIFULLAH JADOON

    10 f’c

  • Richard Landesman

    9

  • yorkie

    9

  • Carl Fuglein

    7

  • Weebee

    6

  • sk

    8

  • donis

    9 F’s

  • clay lister

    there were 9

  • ovidel

    Is not the point of counting the “f”-s but not seeing the repetition of “of” in the text.

  • FX Jiwanto

    There are 10 f’s found.

  • tabby

    4

  • JohnE

    I count 10. I’m guessing some duplicate words were meant to throw us off. If I’m wrong then I’ll like it.

  • J

    10

  • Guy

    There are 8 f’s

  • BARRY

    5

  • Blair

    Hint: there are two of’s in the third, and fourth sentence.

  • dabandit

    I count 10 1st & every try
    including the two double “of”s

  • Jim

    eight + Two repetition of the word “of”, which people are likely to miss because they are too busy counting.

  • JOAN

    10

  • Jrd

    I believe there are 9

  • Dave

    Eight

  • Eugene Kurtzer

    I found 9.

  • Herman

    9

  • Barbara

    9

  • dp

    10 F’s
    … of scientific … of of … Professor … of of … of … find … spaghettification

  • Jeff

    9. But I knew what to look for.

  • Jason

    I counted 10

  • Arabella

    10

  • Ramyak Rohan Mohanty

    I got 9 F’s…..

  • thelma huss

    9

  • Peach

    There are 0 ‘F’ in the text (but 9 ‘f’)

  • daidaloos

    9

  • Linda Muse

    I counted 9.

  • FJL

    ‘f’ … total 9

  • -zZz-

    There 10 f. But two of them are due to repeated “of”…

  • cimone62

    I found 8

  • James Howde

    Nine

    And re-reading it I missed the one in “University of Ushuaia”

  • Linda

    9

  • Bob

    9

  • ojo

    You requested Capital-”F”. The answer is none.
    f is 10 times in the text.
    :)
    Greetz from Stuttgart
    ojo

  • Marcel

    I counted 10 f’s

  • Belinda

    I counted 10

  • Christine

    8 — with two “of of”s

  • bdavidgiants10

    10

  • Marc

    10

  • Iosefvs

    9

  • Cameron

    The trick is that the human mind adimaticaly skips over the f’s in the word of.

  • http://www.care4clean.co.uk szmegma

    There is 10 “F”.

  • Red

    10, if you got less recount the “of”s

  • http://moillusions.com Tilley

    6
    7
    6
    I had to count more than once

  • Rabbit

    8. How are people getting 10? Re-read it, got 9… Still no 10…Nope, still 9…Hmm…

  • Tom

    9

  • Stuart

    Amazing… I went back and back, and could still only count 9. Went into photoshop and crossed out non-F’s and marked the F’s. Still only found 9.

    For some reason, like James, I didn’t see the “University of Ushuaia”. My brain seems to have chunked that as one unit without an ‘of’ in it!

    Great puzzle!

  • Zero

    I didn’t count, but guys, do you see it? Word “of”
    mostly is seen two times in a row!

  • http://moillusions.com Sarah

    i got 4. so confused.

    • booty

      i got 4 too lol

  • http://moillusions.com Sarah

    i counted again and got 6

  • patty

    9 including the 2 extra ofs, now I’m going back to see if I missed one because some counted 10.

    • James Dean

      Good luck :)

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