At first, I thought it was a 3-D stereo image-- with one of the images flipped
horizontally (that is, meant to be viewed in a mirror). The outer rims of the
two images seem to have corresponding features. So I flipped one of the images
in Photoshop, and tried combining them in my eyes and brain; but my stereo
assumption didn't work out (except *maybe* for some of the craggy features at
the very outer rim?)

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