Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!ames!haven!uvaarpa!mcnc!ecsvax!dukeac!klg
From: klg@dukeac.UUCP (Kim Greer)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <1276@dukeac.UUCP>
Date: 9 Mar 89 11:55:55 GMT
References: <207400002@s.cs.uiuc.edu> <1247@wasatch.UUCP>
Reply-To: klg@dukeac.UUCP (Kim Greer)
Organization: Academic Computing, Duke University, Durham, NC
Lines: 37

In article <1247@wasatch.UUCP> u-jmolse%sunset.utah.edu.UUCP@wasatch.UUCP (John M. Olsen) writes:
+In article <207400002@s.cs.uiuc.edu> carroll@s.cs.uiuc.edu writes:
++RE: 3-D from repeating 2-D patterns
+
+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"                \/\/


  Has anyone ever used this as a crypto mechanism ?  With several different
offsets in the same message, maybe you could get several messages in the
same "paragraph".  
-- 
Kim L. Greer                       
Duke University Medical Center		try: klg@orion.mc.duke.edu
Div. Nuclear Medicine  POB 3949            dukeac!klg@ecsgate
Durham, NC 27710  919-681-2711x223      ...!mcnc!ecsgate!dukeac!klg           		fax: 919-681-5636