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Feb 13, 2018 at 11:30 comment added leftaroundabout Such a design needn't even be completely planned. The city Cologne has a pretty concentric layout as well, which mostly just evolved slowly over time – it being a pretty old city (ancient Roman) that never grew very fast so there aren't big rectangular patches, but it did keep growing over the centuries. Any extension would tend to try and keep close to the center, giving naturally a circular shape, and this was amplified by the desire to enclose as much as possible efficiently in walls. — But, is “single disc” what the OP was asking?
Feb 12, 2018 at 18:27 history answered wetcircuit CC BY-SA 3.0