https://en.m.wikipedia.org/wiki/Pozzo_di_San_Patrizio
Epic build. There is a double helix staircase around the well to enable one line of donkeys up and one down at the same time.
Why wouldn't they have a up/down multi-bucket contraption instead? And then have only one donkey pull the wheel to power it.
Not sure they had those invented at the time already.
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