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"If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is."
John von Neumann

This image combines several layers of images shot above Tassili n'Ajjer in Algeria by the Landsat satellite (using infrared, near-infrared, and visible light) in the year 2000. The first shows the original image, the two following I cut out in original resolution.

201214   |   photo geography earth mountain rock sand river rainbow