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Re: CHAT: Ultraviolet (was: Orange)

From:JS Bangs <jaspax@...>
Date:Thursday, June 13, 2002, 21:17
Andy Canivet sikyal:

> >Well, I do have a sight good enough to become a fighter pilot (though I > >abandoned that path after 1 week in military school), but I do have > >difficulties seeing those "secret pictures". In fact, when I see them, they > >appear inversed to me (what should be in front appears back, and > >vice-versa). I > >don't know where it comes from... > > > > I think those things are pretty tricky to see even if you have your > stereoscopic cells - and you would have to have them if you see anything > other than a flat page. The reversal could be a perceptual disembedding > thing - kind of like the "Necker cube" illusion (the transparent cube that > looks popped in or popped out) or the Vase-face illusion (a vase, or two > faces looking at each other)... at first you see one picture, then you > notice the details of another picture and see it instead, but never both at > the same time. The picture you see first is just a matter of luck I think. > > I suspect if you looked at a magic eye long enough, you'd see the other > side. Next time you see one, try to focus your attention on the negative > space instead of the image, and don't to keep yourself from trying to > evaluate what the picture actually is, and it may help to shift your > perception.
This will not work. As somebody else said, the depth orientation that you see depends on whether your eyes are focused on a point in front of the image or behind the image--there's nothing psychological about it. Most are designed to be seen by focusing on a point behind the image, and if you look at them the other way you'll see the 3D features reversed. Jesse S. Bangs jaspax@u.washington.edu http://students.washington.edu/jaspax/ "If you look at a thing nine hundred and ninety-nine times, you are perfectly safe; if you look at it the thousandth time, you are in frightful danger of seeing it for the first time." --G.K. Chesterton