Brain test illusion

2

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  • Reply 21 of 46
    marcukmarcuk Posts: 4,442member
    Quote:
    Originally Posted by Splinemodel View Post


    soulcrusher: right-hand-rule, you physics grad student, you. Positive is anti-clockwise. Know your cross-product & curl.



    I look at this damn thing, and it's nothing but clockwise: no luck whatsoever in changing directions by will, and no flip-flopping as I think about it. I also can't do "Magic-Eye." I've suspected for a while that I am right-brain dominant. I intentionally didn't read the description until after I looked, just to avoid any kind of influence. I sent a link to the other members of my immediate family, who are stereotypical left-brainers. I am curious to see what they report.



    I remember magic eye books from the early 90's. Once you mastered it, you could see it really easily. But you had to stop because it gave me a pretty bad headache after a while!



    Infact, i just looked on google, and there are magic eye images all over the place
  • Reply 22 of 46
    Quote:
    Originally Posted by MarcUK View Post


    I remember magic eye books from the early 90's. Once you mastered it, you could see it really easily. But you had to stop because it gave me a pretty bad headache after a while!



    When they were the in-thing, I was of the age when life isn't so busy. What this means is that I had a lot of opportunities to work at it, but Magic-Eye was not to be. Even with this dancer, if I fade out or use peripheral vision, I still see the frames and not the illusion. The part of my brain that adjusts observations to accord with sensible reality is totally busted.
  • Reply 23 of 46
    gongon Posts: 2,437member
    I couldn't even imagine this going counterclockwise.



    So, I opened it (in Preview) and scrolled it back and forth. First thing I noticed was that it was an authentic illusion - to me it looked like clockwise motion to both directions.



    One frame in the gif isn't a proper silhouette, it has one leg in front of another. You can see it as a little flash in the thigh region while the picture is animating in a browser. When I stared at that still picture for a while and then started onwards manually frame by frame, I saw counterclockwise.



    Ergo: the model the illusion is done with is actually going counterclockwise.
  • Reply 24 of 46
    aslan^aslan^ Posts: 599member
    She's on her left leg when going clockwise, and her right leg when going counter clockwise.



    I'm afraid I don't see any illusion, she really does change directions.
  • Reply 25 of 46
    gongon Posts: 2,437member
    Turns out I can easily see her going counterclockwise if I cover the lower part of the picture.



    And once I see it, it stays easily even if I cover the picture for a good while, read something in another browser tab etc.
  • Reply 26 of 46
    sdw2001sdw2001 Posts: 18,011member
    Now this is totally weird:



    First time it was straight up counter-clockwise.



    Then today I saw it and it was clockwise.



    Then I looked away and read the text, looked back up and it was counter-clockwise.



    WTF.
  • Reply 27 of 46
    Quote:
    Originally Posted by SDW2001 View Post


    Now this is totally weird:



    First time it was straight up counter-clockwise.



    Then today I saw it and it was clockwise.



    Then I looked away and read the text, looked back up and it was counter-clockwise.



    WTF.



    The lady on the screen is trying to tell you something.



    p.s. i can make it spin both way before she makes a complete rotation. But perdominantly when i first take a look at her she's going clock wise.
  • Reply 28 of 46
    Animated GIF with 34 frames, so divide up your analog clock (360 degrees) by 34.



    Now in addition, superposition her apparent vertical motion, to her apparent rotational motion.



    Now make her into a silhouette, shade the interior uniformly (black in this case), and since she is a bilateral creature (vertical symmetry) this creates an ambiguity in her true handedness.



    Solution, take 34 cameras placed uniformly around a horizontal plane, superposition a vertical (say H/2 cosine theta + arbitrary constant not divisible by 34) spreading function to create appearance of vertical motion, synchronize and take said 34 pictures at the exact same time.



    Have a nice day!



    PS - I sure would have liked to have been there for the photo shoot!
  • Reply 29 of 46
    Quote:
    Originally Posted by franksargent View Post


    Animated GIF with 34 frames, so divide up your analog clock (360 degrees) by 34.



    Now in addition, superposition her apparent vertical motion, to her apparent rotational motion.



    Now make her into a silhouette, shade the interior uniformly (black in this case), and since she is a bilateral creature (vertical symmetry) this creates an ambiguity in her true handedness.



    Solution, take 34 cameras placed uniformly around a horizontal plane, superposition a vertical (say H/2 cosine theta) spreading function to create appearance of vertical motion, synchronize and take said 34 pictures at the exact same time.



    Have a nice day!



    urika
  • Reply 30 of 46
    brussellbrussell Posts: 9,812member
    It reminds me of the hollow face illusion. You can find instructions to make this dragon illusion too. I've made several and they create the illusion pretty well.



    (It still has nothing to do with left-brain/right-brain though. )
  • Reply 31 of 46
    Quote:
    Originally Posted by BRussell View Post


    It reminds me of the hollow face illusion. You can find instructions to make this dragon illusion too. I've made several and they create the illusion pretty well.



    (It still has nothing to do with left-brain/right-brain though. )



    Agreed, if you look at that list it appears rather sexist, an "emo" side and an "anal" side, males are "supposed" to be more "analytical" while females are "supposed" to be more "emotional" and now I have to check my privates because I have attributes that fall into both columns, looking down now ...



    ... yup, I'm a hermaphrodite! I think it's about time I go and eff myself!
  • Reply 32 of 46
    Quote:
    Originally Posted by MarcUK View Post


    well, its on my list of 101 things to do before I die. Before that though, I want a gangbang with 10 lesbians in Prague!



    To swing both ways they need to be shemales instead of lesbians.
  • Reply 33 of 46
    Quote:
    Originally Posted by Gon View Post


    I couldn't even imagine this going counterclockwise.



    So, I opened it (in Preview) and scrolled it back and forth. First thing I noticed was that it was an authentic illusion - to me it looked like clockwise motion to both directions.



    One frame in the gif isn't a proper silhouette, it has one leg in front of another. You can see it as a little flash in the thigh region while the picture is animating in a browser. When I stared at that still picture for a while and then started onwards manually frame by frame, I saw counterclockwise.



    Ergo: the model the illusion is done with is actually going counterclockwise.



    That is frame 13, but I do think it is a static image taken from multiple cameras, and they didn't fully edit the silhouette/black out process properly in that frame, if they had, you wouldn't be able to discern a definitive "direction of rotation."
  • Reply 34 of 46
    It's probably illustrated using a 3D graphics program. There is only so much tweaking you can do to the illumination to get an image useful for this sort of test... and you have to create it to rotate one direction or another...
  • Reply 35 of 46
    Quote:
    Originally Posted by hardeeharhar View Post


    It's probably illustrated using a 3D graphics program. There is only so much tweaking you can do to the illumination to get an image useful for this sort of test... and you have to create it to rotate one direction or another...



    Yes, of course that would be much easier, can't tell by the size of the animation, but it is rather "lifelike" considering the proportions. And yes, the illumination would be critical if this were a real person.
  • Reply 36 of 46
    dfilerdfiler Posts: 3,420member
    Hmmm, what if she rotates back and forth, facing away from me? This happened while concentrating and trying to make it go counter-clockwise.



    It seems like the shadow will only be valid for one direction of rotation though right? Clockwise. Unless that is, the model is being viewed from below a transparent floor?
  • Reply 37 of 46
    Huh. At first she was rotating counter-clockwise, then when I concentrated on her feet, she changed to clockwise.





    And now she won't change back. Which is wierd.
  • Reply 38 of 46
    nvidia2008nvidia2008 Posts: 9,262member
    Wow, I cannot get it to do anything other than move clockwise. First thing I noticed was the firm female figure that is quite obviously 3D, probably from the application "Poser". The other thing is that the motion of "falling clockwise" with the right arm out is my interpretation of a more natural dance move.
  • Reply 39 of 46
    nvidia2008nvidia2008 Posts: 9,262member
    OK got it... If I cover the top half of the body and just look at the feet, and imagine going counter-clockwise, I can see it. Then I uncover the top half of the body and voila! going counter-clockwise. Whoaa. Duddde, like, whooaaaa.



    It is much easier for me to see it going clockwise, to see it going counter- I have to focus on the feet...



    Very trippy.
  • Reply 40 of 46
    nvidia2008nvidia2008 Posts: 9,262member
    If I squint/ blink hard for a while, then imagine which way a real dancer would be moving counter- or clock-wise, I can now see on demand which way I want to see it. Cool ... I think I have a headache now, honestly. Sh11t.... I have to take a ferry ride soon, my balance is all screwed up in my head.... I think I will be sea-sick and car-sick for the next several hours. ARHGHGHGHGH
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