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]                32008   32008 100.0% -lh0- 6b6a Sep  4  1994 3degapic.gif
[generic]                  472     873  54.1% -lh5- c4d0 Sep  4  1994 3degapic.gif.info
[generic]                31884   31884 100.0% -lh0- c03f Sep  4  1994 3dplanes.gif
[generic]                  468     873  53.6% -lh5- 75ca Sep  4  1994 3dplanes.gif.info
[generic]               242676  242676 100.0% -lh0- aaee Sep  4  1994 ash.gif
[generic]                  468     873  53.6% -lh5- 11b3 Sep  4  1994 ash.gif.info
[generic]               149302  149302 100.0% -lh0- 9e9e Sep  4  1994 bowl.gif
[generic]                  468     873  53.6% -lh5- b064 Sep  4  1994 bowl.gif.info
[generic]                31237   31237 100.0% -lh0- ef4e Sep  4  1994 bridge.gif
[generic]                  468     873  53.6% -lh5- c50a Sep  4  1994 bridge.gif.info
[generic]               286621  286621 100.0% -lh0- c69b Sep  4  1994 btvnrds.gif
[generic]                  467     873  53.5% -lh5- 2285 Sep  4  1994 btvnrds.gif.info
[generic]                31176   31176 100.0% -lh0- a276 Sep  4  1994 comet.gif
[generic]                  465     873  53.3% -lh5- ee41 Sep  4  1994 comet.gif.info
[generic]               136667  136667 100.0% -lh0- d43e Sep  4  1994 cynthia.gif
[generic]                  467     873  53.5% -lh5- c464 Sep  4  1994 cynthia.gif.info
[generic]               334141  334141 100.0% -lh0- 1cee Sep  4  1994 DonnaSIS.gif
[generic]                  468     873  53.6% -lh5- cdea Sep  4  1994 DonnaSIS.gif.info
[generic]                   92      97  94.8% -lh5- 3e95 Sep  4  1994 DonnaSIS.txt
[generic]               180408  180408 100.0% -lh0- ce55 Sep  4  1994 earthrds.gif
[generic]                  471     873  54.0% -lh5- 49c4 Sep  4  1994 earthrds.gif.info
[generic]                37828   99155  38.2% -lh5- b1d8 Sep  4  1994 sirds-faq
[generic]                  330    1091  30.2% -lh5- 4837 Sep  4  1994 SIRDS-FAQ.info
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        23 files 1499052 1565193  95.8%            Dec  1  1994