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Looks like a Microfilm reader?
As for the joke... It's like the dungeon was so huge they had to "shrink" it to microfilm to be able to fit in "1 page".I wouldn't say it's a great joke, but that's what I got out of that.
...circa 1984 i drafted a dense full-page dungeon on ⅒-inch graph paper; it was fairly mega-scale...