If by no approximations you mean analog… all I can think of is the MONIAC hydraulic computer, used to simulate the flow of money in a national economy. Built at the London School of Economics, a remaining one now lives in the foyer of the Reserve Bank building in Wellington, New Zealand: https://www.youtube.com/watch?v=rAZavOcEnLg
Aside from this, my OpenClaw agent suggested wind tunnels and wave tanks, which I think are closer to what you’re getting at?
If by no approximations you mean analog… all I can think of is the MONIAC hydraulic computer, used to simulate the flow of money in a national economy. Built at the London School of Economics, a remaining one now lives in the foyer of the Reserve Bank building in Wellington, New Zealand: https://www.youtube.com/watch?v=rAZavOcEnLg
Aside from this, my OpenClaw agent suggested wind tunnels and wave tanks, which I think are closer to what you’re getting at?