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A folded hiking map
Scale and Contour Lines
Unfold the map and you are holding a flat sheet; under your boots lies ground that is neither flat nor two-dimensional. The sheet has to do three jobs at once: shrink the world, flatten a curved surface, and hand back the third dimension it lost while flattening. None of the three is free, and what it costs is not the cartographer's choice.
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The answer to the question is right here. Open the founding month and you can walk all three layers of this concept, and read your own photos too.
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