This image is actually perfectly still. Isolate or focus on any one part of it and you'll see that its apparent movement is just a very strange optical illusion.
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UPDATE: Welcome Boing Boing readers! While you're here, why not get involved in our Foam Hat Story Project?
UPDATE 2: Anonymous in the comments brings to my attention Akiyoshi Kitaoka, apparently the creator of the almond illusion. Didn't know who made it, man, I just found the file someplace.
Anyway, please, check out some of his other work
. A lot of similiar optical illusions. Completely amazing.