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The MONIAC built in the 1950s by Bill Phillips (of Phillips curve fame) attempted to model economic processes with coloured water (fluidic logic)

https://en.m.wikipedia.org/wiki/MONIAC



I just love whenever the roundworld equivalent of something I first encountered on the discworld pops up in front of me.


:D It goes both ways! Having known about it prior, it was very exciting to read about it in Discworld.


Have never been able to ascertain what model it actually uses e.g. a system of linear equations, if so which ones?


Vividness has its advantages. You could call it a simulator as well as one of the world's first dashboards as well.




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