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Oh also this sort of exists in Europe on a smaller scale, perhaps most strikingly is the bastion fort and village of Palma nova. It’s frankly beautiful but it’s a village so the infrastructure is limited to walking or road transport rather than extensive metro or rail links. However it does prove the initial concept. Personally I think it would be more ideal for a city to be made of multiple circles forming a honeycomb arrangement, with each circle representing a distinct borough or community, it would make local administration easier and could also ensure the creation of local markets or identities in an otherwise individualistic urban and metropolitan environment.