Single image 3D pics (Magic Eye style)

Have you walked through a mall lately? These days, as you wander past
most of the poster shops, there will be a large group of people
staring at the same poster with surprisingly weird expressions on
their faces. Some will be in the initial stages of denial or
rejection---they will be concentrating, some slowly rocking their
heads backwards and forwards, searching for an image that they have
never seen before. Others will be grinning from ear to ear, pointing
at the poster, chuckling with their friends that a member of their
group hasn't seem them yet.  "Come on Bill, come on!", they cry and as
Bill gets increasingly more frustrated he concentrates harder and
harder, until finally (if he's lucky) he sees a true 3D image, without
the need for special glasses or equipment.

These pictures are known as Single Image Random Dot Stereograms
(SIRDS), or Single Image Stereograms (SIS) depending on whether the
picture contains random dots as a base for the 3D effect, or a
repetitive pattern. Unfortunately, each commercial company has
labelled them differently. Shop owners generally don't know what you
mean, unless you say "Hollusion" or one of the many other specific
names.

(Description from SIRDS-FAQ by Stuart Inglis)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                24313   24313 100.0% -lh0- a106 Sep  4  1994 torsords.gif
[generic]                  467     873  53.5% -lh5- 7d4c Sep  4  1994 torsords.gif.info
[generic]                42986   42986 100.0% -lh0- 2a5b Sep  4  1994 tri.gif
[generic]                  463     873  53.0% -lh5- 01bd Sep  4  1994 tri.gif.info
[generic]                32127   32127 100.0% -lh0- 74fe Sep  4  1994 triangle.gif
[generic]                  467     873  53.5% -lh5- fce9 Sep  4  1994 triangle.gif.info
[generic]               244633  244633 100.0% -lh0- 60c2 Sep  4  1994 tricer.gif
[generic]                  468     873  53.6% -lh5- e030 Sep  4  1994 tricer.gif.info
[generic]                  610    1163  52.5% -lh5- 8501 Sep  4  1994 tricer.txt
[generic]                57734   57734 100.0% -lh0- 6e07 Sep  4  1994 tunnel.gif
[generic]                  467     873  53.5% -lh5- f068 Sep  4  1994 tunnel.gif.info
[generic]                24332   24332 100.0% -lh0- 9ceb Sep  4  1994 twisterrds.gif
[generic]                  467     873  53.5% -lh5- 33f6 Sep  4  1994 twisterrds.gif.info
[generic]               213417  213417 100.0% -lh0- ee26 Sep  4  1994 warbird.gif
[generic]                  466     873  53.4% -lh5- 95c7 Sep  4  1994 warbird.gif.info
[generic]                   73      85  85.9% -lh5- ab5f Sep  4  1994 warbird.txt
[generic]                31065   31065 100.0% -lh0- e7bf Sep  4  1994 weave.gif
[generic]                  464     873  53.2% -lh5- d6f5 Sep  4  1994 weave.gif.info
[generic]                42882   42882 100.0% -lh0- 7a6e Sep  4  1994 xwing.gif
[generic]                  468     873  53.6% -lh5- 1222 Sep  4  1994 xwing.gif.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        20 files  718369  722594  99.4%            Dec  1  1994