As a prototypist I can share : - you genuinely learn once your assumptions about how a system works break, you realize it, try differently, validate, get a bet

As a prototypist I can share : - you genuinely learn once your assumptions about how a system works break, you realize it, try differently, validate, get a better model of that system - your interfaces must remain permissive while providing feedback, namely you provide wiggle room then only once it behaves roughly as expected do you tighten then up