Financial infrastructure is usually taught as static diagrams even though the underlying systems are dynamic. People learn the boxes and never see the behaviour: timing, cost, failure and who is exposed while value is in flight.
Understanding improves when people can manipulate the system and observe consequences.
Send £1,000 — London to Lagos
Simulated for this prototype. The point of the real thing is that changing the corridor, the rail or the compliance outcome changes every number above.
The interesting teaching moment is failure, not success. The version that only showed a happy path taught almost nothing.
People do not ask "what are the steps". They ask "who has my money right now". The model had to answer that at every stage.
Fee and FX transparency changed how testers described the product: from a diagram to an argument.