Stereograms are pairs of images intended to be viewed one with the left eye and one with the right eye while focusing so that the two images appear to lie in the same space. Small differences in the images create the illusion that some parts are above or below other parts. In the 1990s there was a popular series of what are called autostereograms - single images with repeating patterns that create the same sort of illusion; this is what usually appears in puzzles.
Puzzles
MIT Mystery Hunt 1999 Warrant 1.3
MIT Mystery Hunt 2003 Whoa-I Have a Migraine
MIT Mystery Hunt 2008 Special Ops
MIT Mystery Hunt 2011 Mario Clash
MIT Mystery Hunt 2020 Chairiot Races
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