GIF Puzzle (Mystery Hunt '96)

Achilles: Hey, I recognize this picture! It's Escher's lithograph Above and Below.
Tortoise: Very astute, Achilles. I don't think I've ever seen it before. It looks pointillistic. Were all those colored speckles in the original work?
Achilles: No, not at all. It looks to me as though someone took a black-and-white scan and randomly sprinkled colored dots all over it.
Tortoise: I know you won't believe this, but this reminds me of the MU-picture in Hofstadter's book.
Achilles: I know you won't believe this, but I was thinking the same thing. How curious...

[GIF PICTURE] which you really need to look at using xv (or equivalent) instead of directly looking at it by browser.

From MIT, you can do this by doing the following:

    add puzzle
    add graphics
    xv /mit/puzzle/96/gifpuzzle.gif