💧 MONIAC — The economy, made to flow
Money, turned into water you can watch move.
🧠 UX Interpretation: Systems made visible through analogy
The MONIAC, built in 1949 by economist Bill Phillips, modelled a national economy using water flowing through transparent tubes and tanks.
Pumps represented income. Valves controlled taxation and spending. Reservoirs held savings and investment.
Instead of equations, you could see the system behave. Adjust a control, and the flow changed.
The model transformed abstraction into something physical.
🎯 Theme: Understanding through simulation
The economy is complex and largely invisible. The MONIAC made it tangible.
It suggested that economic behaviour could be understood as a system of flows and balances.
This was powerful. It invited interaction. It made cause and effect feel immediate.
Yet the simplicity was also its limit. Real economies include human behaviour, shocks, and feedback that do not behave like water.
The model worked because it was graspable, not because it was complete.
💡 UX Takeaways
- Physical analogies can make abstract systems understandable.
- Seeing a system respond builds intuition.
- Interaction deepens understanding.
- Simplification can hide critical variables.
- Models that can be experienced are often more persuasive.
📎 Footnote
The MONIAC (Monetary National Income Analogue Computer) was constructed at the London School of Economics. It used coloured water to simulate the flow of money through an economy and was used for teaching and demonstration.