Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcdc!bayes
From: bayes@hpfcdc.HP.COM (Scott Bayes)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <5040007@hpfcdc.HP.COM>
Date: 8 Mar 89 18:56:24 GMT
References: <6382@thorin.cs.unc.edu>
Organization: HP Ft. Collins, Co.
Lines: 48


>Okay, all you cross-eyed folks.  Read this:
>
>12345678901245q678912l45q78t912l45q7t9z12l457t*9z12l45t*9z1T2l45t*9z1Tl45t*$9
>qwertyui5nqwrtayui5qwxrtayui5qwxrayui5qwxzrauiC5qwxzraiCt5qwxzaiCt57qwza>iCt5
>asdfghjkl;asfghjkl;aszfghklr;aszfghkr;yaszfgkr;yaszgfgr;ya.szggrT;ya.sggrT);y
>zxcvbnm,./zxvb1nm,.zxyvb1m,>.zxyvb1m>.-zxyvbm>T.-xyPvb>TG.-xyPb>pTG.-xPbT>pTG
>12345678901245r678912745r78B912745r7B9t127457By9t27Y45By9t2N7Y5Bry9t2NY5Bry*9
>^         ^
>This is the repeat frequency.  (Sorry for the ugly font.)
>
>Cross-eyed, the text is recessed.  Going diverged makes the text poke out.
>This technique *might* show up in a not-too-distant future Scientific 
>American if Mr. Dewdney things there are enough bug-eyed readers. :^)
>Imagine having stereoscopic wallpaper where only you can see what's there.
>
>The answer: ( quit now if you want to figure it out yourself :^)
>
>Hi thErE.
>
>/\/\ /|  |    /||| /\|       | John M. Olsen, 1547 Jamestown Drive  /\/\
>\/\/ \|()|\|\_ |||.\/|/)@|\_ | Salt Lake City, UT  84121-2051       \/\/
>/\/\  |  u-jmolse%ug@cs.utah.edu or ...!utah-cs!utah-ug!u-jmolse    /\/\
>\/\/             "A full mailbox is a happy mailbox"                \/\/

Very nice!  Diverged is easy for me.  I do it all the time (human
"diff", and stereo pair merge).  Cross-eyed is very difficult.  I can't
convince my eyes to focus.  I was able to hold cross-eyed long enough to
see the "H" and the adjacent "i", but not to actually read.  Reading
diverged is natural.

The proximity of the "y" and "u" in the "5qwxrtayui" background is a
problem.  When looking at the "i", the "y" and "u" between the body and
the dot of the "i" tend to merge (because of their similarity of shape
on my CRT), and come to the foreground, somewhat bashing the "i" (and
the eye :-)

Do you have a "banner" program that'll lay down the text on the
background?  If so, and if you have no problems with mailing me a copy,
please do so.

I'd never thought of trying that effect. It's neat!

You might also consider Jearle Walker (SciAm--Amateur Scientist).  He
occasionally seems to do perception articles.

|  Scott Bayes  |   Scott  Bayes|
|  Scott  Bayes |  Scott Bayes  |