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>From: JS Bangs <[log in to unmask]>
>Reply-To: Constructed Languages List <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: CHAT: Ultraviolet (was: Orange)
>Date: Thu, 13 Jun 2002 14:17:18 -0700
>
>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.
>
>

Do you know what the typical "virtual" distance is from the paper to the
image?  I'm guessing if one were focused on the closer point then the
reversed image would probably be accompanied by a headache for a lot of
people if they were to look at it too long - assuming the nearer image is
relatively close to the viewer and not the one he/she is supposed to be
looking at.

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