.com This unusual 21.25-by-15-inch image of the earth's Western and Eastern hemispheres is a computer-generated collage of several hundred tiny (half-inch-square) photographs of land and water scenes. In putting them together, you are helped a little by the fact that land is land, and water is water (and the dark background consists of visibly darker scenes). It's also easy to see the correct orientation of each piece. Nevertheless, this is one tough puzzle. Try taking six days to complete the planet, and remember to rest on the seventh. --Richard Farr
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