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The MONIAC (a.k.a. the financephalograph) was an hydraulic computer, designed
and built by engineer-turned-economist Bill Phillips in 1949.
Every home should have one!
Made of standardised items (pumps, tubes, valves, buckets), which can be
mounted in a grid framework and plugged together.
Sure, you can build Systems Dynamics models online at insightmaker.com, but
where's the element of family fun? splashing water, whirring pumps, kinaesthetic
MONIAC on wikipedia
Invented by a New Zealander (of course) [sofacrat, May 20 2015]
MONIAC on YouTube
Reserve Bank of NZ has a working model [sofacrat, May 20 2015]