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It's a random-dot stereogram (RDS). It looks like a random mess, but in fact it's a three-dimensional view of a landscape from above. To see it, stare straight through the page, as if the journal you are holding weren't there, and let your eyes relax until the two guides (little squares) at the bottom of the figure appear to separate and become four. Focus your eyes at some place far behind the figure, and make two of the four images coincide so that you now see exactly three guides. Now raise your eyes slowly up to the main part of the figure, without refocusing them. With luck, you'll see an almost palpable three-dimensional image - a hill right at the center, a circular valley surrounding it, and a circular hill surrounding the valley, all seen from above.
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