A cartographer-friend of mine is a graduate of Karlsruhe University in this college town at the edge of the Black Forest in Germany. At her suggestion, I obtained satellite imagery of the town so we could see how its double-ring layout looks from 500 miles out in space.
The colors of the image are not exactly what the satellite "saw." Its sensors picked up infrared energy as well as visible light, and each pixel here represents a combination of visible and infrared light intensity. I fooled around with the colors in photoshop to enhance contrast and make everything look sort of normal but also a little more interesting than normal.
Prince Karl built the purple castle near the center of the picture in 1715, or so I've read. The street running south from his castle into the downtown area has always been the main market street. East and northeast of the castle is Karlsruhe University, a scientific and engineering school and research institute. Near the edge of town--but intentionally cropped out of the picture--is the largest oil refinery in Germany.
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