Test ideas, not just products
Rapid prototyping is a way to move from imagining possibilities to testing them. It applies not only to products, but also to ideas: teams make an idea tangible enough to interrogate its assumptions, learn from what does not work and iterate towards what does.
This approach depends on giving people room to imagine freely and build on each other's ideas, rather than immediately narrowing the discussion to feasibility. Prototyping then brings action to that imaginative work. The purpose is not to avoid every unsuccessful attempt, but to make those attempts useful.
We call this practice intelligent failing: quickly testing assumptions, learning from unsuccessful attempts and refining the approach. A prototype becomes valuable through the learning it enables, rather than simply through whether the first version succeeds.