British canals mostly built 18th-19th cen: space-filling flow network akin to circulatory systems & highways/streets.pic.twitter.com/E9aEDaiCRR
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@GregorMacdonald Too much environmental disruption & worker risk & long time scale for modern tastes.
@NickSzabo4 Yes, big change since 19thC as society faces up to externalities. Creates tension: doing big stuff vs small footprint stuff.
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