Fortification spectra

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Jagged zigzag lines in parallel bands are sometimes seen in the aura preceding classical migraine. The type of fortification they resemble is the star-shaped spiky plan form of forts typified by those designed by https://en.wikipedia.org/wiki/Vauban well after cannon changed warfare, not the wall-top crenellations of the arrow era. (An image of a Dutch star fort can be found at Wikipedia)