|  |  |  |  | Dr Max Robert Coherence The lines should relate to each other so that they have good shape. This means exploiting parallelism and symmetry, aligning stations and termini for neatness, and creating well- recognised features such as circles and horizons. Coherence is subtle and hard to attain, but it makes the difference between a good map and a great map.   CurvylinearOctolinear
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