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Original Usenet thread from alt.ascii-art, started 11 May 1994.
 _   _                     _        _             _     _           
| | | |___  ___ _ __   ___| |_     / \   _ __ ___| |__ (_)_   _____ 
| | | / __|/ _ \ '_ \ / _ \ __|   / _ \ | '__/ __| '_ \| \ \ / / _ \
| |_| \__ \  __/ | | |  __/ |_   / ___ \| | | (__| | | | |\ V /  __/
 \___/|___/\___|_| |_|\___|\__| /_/   \_\_|  \___|_| |_|_| \_/ \___|
Nice man posts optical illusions on alt.magic

Nice man posts optical illusions on alt.magic

alt.ascii-art · 1 message · 11 May 1994
Allan L. Goodman <ago...@mcs.com> wrote:
>I'm not sure this is the right group but I would appreciate any examples of
>optical illusions.  please post to the group or E-mail.
>Thanks. 

Probably not, but it just so happens that I am the keeper of the list of
impossible objects.  Some were drawn by me (PH), the others, where possible
are credited.
----------------------------------------------------------------------


		   Canonical List of Impossible Objects


If anyone out there has an impossible drawing, signature, or anything like that
please email it to me, and I will try to include them in this list.
	The ones marked PH are by me, the others are by someone or other - I 
have no idea who.  Please e-mail me info on these unknown ones.
==============================================================================
                                _____
                               /    /\
                              /    /  \
                             /    /    \
                            /    /  /\  \
                           /    /  /  \  \ 
                          /    /  /\   \  \
                         /    /  /  \   \  \
                        /    /__/____\   \  \
                       /              \   \  \
                      /________________\   \  \
                      \_____________________\ /
                       					PH
=============================================================================


							 _______________
							/ 	/      /|
						      /       /      /  |
						    /       /      /    |
						  /       /      /      |
						/	/      /       /
					      /       /      /       /
					    /       /      /       /
                                          /       /      /       /
					/	/      /       /
				      /_______/      /       /
				     |        |    /       /
				     |        |  /       /
				     |        |/       /
             			     |--------|	     /
				     |        |    /
				     |	      |  /
				     |________|/
								PH
===============================================================================

							
				/ \
			      /     \
			    /         \         
			   |\         /|      / \
			   |  \     /  |    /     \
			   |    \ /    |  /         \
			   |     |     |/         /  |
			   |     |     |        /    |
			   |     |     |      /      |
			   |     |     |    /        |
			   |     |     |  /          |
                           |     |     |/     /|     |
                          / \    |    /     /  |     |
                        /     \  |  /     /    |     |
		      /         \|/      |     |     |
		    /           /        |     |     |
                  /           /          |     |     |
		/     	    /            |     |     |
       	      /		  /     /|       |     |     |
	     |\		/     /  |       |     |     |
	     |  \     /     /    |       |     |     |
	     |	  \ /     /      |       |     |     |
	     |     |	 |	 |       |     |     |
	     |	   |     |       |       |     |     |
	     |     |     |       |       |     |     |
	     |     |     |       |       |     |     |
	     |     |     |       |       |     |     |
	     |     |     |       |       |     |     |
             |     |     |       |       |     |     |
            /|     |     |       |       |     |     |
  	  /  |     |     |       |       |     |     |  
        /    |     |     |       |       |     |     |    
      /      |     |     |       |       |     |     |\
      \       \    |    /|       |       |\    |    /   \
        \       \  |  /  |       |       |  \  |  /       \
	  \	  \|/    |       |       |    \|/       /
	    \		 |       |       |   	      /
  	      \          |       |       |    	    /
		\	  \	 |      /         /
		  \	    \    |    /     	/
		    \	      \  |  /	      /
		      \         \|/         /
			\		  /
			  \		/
			    \         /
			      \	    /
				\ /				PH
===============================================================================

					/ \
				      /	    \
				    /	      \ / \
				  /	      /     \
				 |\	    /         \
				/ \ \	  /		\
			      /     \ \  |\		  \ / \
			    /	      \ \|  \		  /	\
			  /		\|    \	    / \	/	  \
			/		/|	\ /     \	    \
		       |\	      /  |  / \	/         \	    /|
		      / \ \	    /    |/   	\	    \     /  |	
		    /	  \ \	  /     /	  \         /|  /    |   
		  /	    \ \ /     /	            \ 	  /  |/	     |
	        /	      \|    / 		    /|  /    |	     |
	       |\	      /|  /    		  /  |/	     |	     |
	       |  \         / / \  		/    |	     |	     |
	       |    \	  / /	  \           /      |       |       |
	       |      \	/ /	    \  	    /        |	     |	     |
	       |       |/	      \   /	     |	     |	     |
	       |       |\	      /|/	     |	     |       |
               |       |  \         /  |             |       |       |
               |       |    \     /    |             |       |       |
               |       |      \ /      |             |       |       |
               |       |       |       |             |       |       |
               |       |       |       |	     |       |       |
               |       |       |       |             |       |       | 
	       |       |       |       |	     |	     | 	     |
	       |       |       |       |             |       |       |
	       |       |       |       |             |       |       |
	       |       |       |       |             |       |       |
               |       |       |       |             |       |       |
               |       |       |       |             |\      |      /
	       |       |       |       |             |  \    |    /
	       |       |       |       |             |    \  |  /
		\      |     / |       |             |      \|/
		  \    |    /  |       |             |   
                    \  |  /    |       |             |
                      \|/      |       |             |
                               |       |            /
			       |       |          /
                               |       |        /
				\      |      /
				  \    |    /
				    \  |  /
                                      \|/
							PH
================================================================================




		 ______________________________
		0___________________________   |
		 __________________________/|  |
		0__________________________l|  |
		 ______________________________|
  		0_____________________________/


=============================================================================

		     / \
	      	   /     \
		 /         \
		|\	     \
		|  \	       \
		|    \		 \
		|      \ 	   \
		|\ 	 \	     \
		|  \	   \	       \
		|    \	     \	         \
		|     |\       \  	   \
		|     |  \       \           \ 
		|     |    \	   \	     / \
		|     |     |\	     \	   /     \
		|     |     |  \       \ /	   \
		|     |	    |	 \      |\         /|
		|     |     |      \    |  \     /  |
         	|     |     |        \  |    \ /    |
  		|     |     |          \|     |     |
		|     |     |		|     |     |
              	|     |     |   	|     |     |
		|     |     |		|     |     |
		|     |     |		|     |     |
		|     |     |     	|     |     |
		|     |     |		|     |     |
		|     |     |		|     |     |
		|     |     |          / \    |    /|
		|     |     |        /     \  |  /  |
		|     |     |      /         \|/    |
          	|     |     |    / 	     /	    |
		|     |     |  /  	   /       /
         	|     |     |/		 / 	 /
         	|     |     |          /       /
		|     |     |	     /	     /
		|     |     |      /       /
		|     |     |    /       /
		|     |     |  /       /
		|     |     |/	     /
		|     |     |      /
		|     |     |    /
		|     |     |  /
		|     |     |/
      		 \    |    /
		   \  |  /
		     \|/				PH

===============================================================================


		 _____________________________
		0__________________________   |\ 
		 __________________________|  | |
		0__________________________|  | |
		 _____________________________| |
		0______________________________\|		PH

==============================================================================


         __________________________
        / _____________________  /|
       / / ___________________/ / |
      / / /| |               / /  |
     / / / | |              / / . |
    / / /| | |             / / /| |
   / / / | | |            / / / | |
  / / /  | | |           / / /| | |
 / /_/___| | |__________/ / / | | |
/________| | |___________/ /  | | |
| _______| | |__________ | |  | | |
| | |    | | |_________| | |__| | | 
| | |    | |___________| | |____| |
| | |   / / ___________| | |_  / /
| | |  / / /           | | |/ / /
| | | / / /            | | | / /
| | |/ / /             | | |/ /
| | | / /              | | ' /
| | |/_/_______________| |  /
| |____________________| | /
|________________________|/                                             

=============================================================================

                 ____ 
                /.../\ 
               /.../##\ 
              /.../####\ 
             /.../######\ 
            /.../###/\###\ 
           /.../###/  \###\ 
          /.../###/\   \###\ 
         /.../###/  \   \###\ 
        /.../###/    \   \###\ 
       /.../###/      \   \###\ 
      /.../###/        \   \###\ 
     /.../###/          \   \###\ 
    /.../###/            \   \###\ 
   /.../###/______________\   \###\ 
  /........................\   \###\ 
 /..........................\   \###\ 
-----------------------------    \###/ 
\                                 \#/ 
 \_________________________________/ 

===========================================================================
	_________    	 _________	  _________
	|\_______\   	 |_______|	 /_______/|
	| | _____ |	 | _____ |	| _____ | |  - a poor attempt at
	| | | | | |	 | | | | |	| | | | | |    a 3d picture.
	| | | | | |  	 | | | | |	| | | | | |    Unfocus your eyes, and
	| | | | | |	 | | | | |	| | | | | |    you probably still 
	| | | | | |	 | | | | |	| | | | | |    won't get it
	| | | | | |	 | | | | |	| | | | | |
	| | | | | |	 | | | | |	| | | | | |
	\_/ \_/ \_/ 	  \_/ \_/	\_/ \_/ \_/
								PH
============================================================================
Clara Fitzgerald uses in her sig a variation on Escher's
famous fork:

   _________________________
 /______________________    |
|    _________________ /|   |
|   | |_______________|_|   |
|   |/______________________|
|__________________________/


Here is a larger version of that variation: 

     ,aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    d'                                                                    8
  ,P'                                                                     8
,dbaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa        8
8                                                              d"8        8
8                                                             d' 8        8
8        aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaad'  8        8
8        8   8                                               8   8        8
8        8   8                                               8   8        8
8        8  ,8aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa8aaa8        8
8        8 ,P                                                             8
8        8,P                                                              8
8        8baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaad'
8                                                                       d'
8                                                                      d'
8aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaP'
                          Normand  Veilleux


And here is a variation on one of PH's diagrams:

                     ,aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
                   ,d"                           ,d"8
                 ,d"                           ,d"  8
               ,d"       ,aaaaaaaaaaa        ,d"    8
             ,d"       ,d"8      ,d"       ,d"      8
           ,d"       ,d"  8    ,d"       ,d"       ,8
         ,d"       ,d"    8  ,d"       ,d"       ,d"
       ,d"       ,d"      8,d"       ,d"       ,d"
     ,d"       ,d"       ,8"       ,d"       ,d"
   ,d"       ,d"       ,d"       ,d"       ,d"
 ,PaaaaaaaaaaP       ,d"       ,d"       ,d"
 8          8      ,d"       ,d"       ,d"
 8          8    ,d"       ,d"       ,d"
 8          8  ,d"       ,d"       ,d"
 8          8,d"       ,d"       ,d"
 8aaaaaaaaaa8P       ,d"       ,d"
 8          8      ,d"       ,d"
 8          8    ,d"       ,d"  Normand
 8          8  ,d"       ,d"    Veilleux
 8          8,d"       ,d"
 8aaaaaaaaaa8P       ,d"
 8          8      ,d"
 8          8    ,d"
 8          8  ,d"
 8          8,d"
 8aaaaaaaaaa8P

-- 
Normand Veilleux
nve...@emr1.emr.ca
=========================================================================


Here are two I made. The first used to be my sig.

 __      ___________
|\G\    |\  ________\
| \r\   | \ \_____  |
|  \e\   \S\ \  | |d|		Life is like a grapefruit:
|   \a\   \t\ \ | |a|		it's sort of orangy-yellow
| |\ \t\   \e\ \| | |		and dimpled on the outside,
| | \ \i\   \p\ | |S|		wet and squidgy in the middle.
| |f|\ \n\   \h\| |i|		It's got pips inside too...
| |r| \ \g\   \a| |l|		Oh, and some people have half
| |o|__\_\s\   \n |v|		a one for breakfast.
| |m|_______\   \ |a|
 \|_________|    \|_|

 ____________
|\  _________\
| \ \_______  |
|  \ \    | | |
|   \ \   | | |
| |\ \ \  | | |
| | \ \ \ | | |
| | |\ \ \| | |
| | | \ \ | | |
| | |__\_\| | |
| | |_______| |
 \|___________|

       Sil...@STPC.WI.LeidenUniv.NL || SdS...@STHP.WI.LeidenUniv.NL
=============================================================================
+--------------------+--------------------------------------------------------+
|                    |     ___________________                                |
| Torbj|rn Andersson |    /  ________________() "Fainali, xen, aafte sam 20   |
| Kantorsgatan 8:415 |   /  /|______________    iers ov orxogrefkl riform, wi |
| 754 24 Uppsala     |  /  /_/_____________()   wud hev a lojikl, kohirnt     |
| Sweden             | /__________________      speling in ius xrewawt xe     |
| 018 - 26 07 66     | |_________________()     Ingliy-spiking werld."        |
|                    |                                         -- Mark Twain  |
+--------------------+--------------------------------------------------------+


Hope you enjoyed them
PH
-- 
*-         * -        *  -       *   -      *    -     *Just relax your eyes.
* | | |    *| | | |   * | | | |  *  | | | | *   | | | |*Stephen "PH" Buxton
*-  |-|    *|-  |-|   * |-  |-|  *  |-  |-| *   |-  |-|*mei...@cch.cov.ac.uk
*   | |    *|   | |   * |   | |  *  |   | | *   |   | |*mei...@cck.cov.ac.uk

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