Most demos perform: here's the thing, be impressed. The best ones leave room, so other people start building the idea in their own heads and join the work.
A demo this week did something I want to bottle. One of my designers showed an assistant feature he’d been prototyping, nothing polished, a working slice of an idea. And by the end of it, the engineers in the room weren’t giving feedback anymore. They were asking questions. How would this handle that edge case. What if we extended it to the next surface. Could it hook into the thing they were already building. The demo had stopped being his and started being theirs.
Most demos don’t do that. Most demos are a performance: here’s the thing, here’s how good it is, please be impressed. They land, people say nice work, the moment closes, and everyone goes back to their own priorities. The work got admired and went nowhere. I’ve given a hundred of those and mistaken the applause for momentum.
What this one did differently was leave room. It didn’t arrive finished and airtight, it arrived working but open, with the obvious next questions visibly unanswered. That’s an invitation. When people can see where an idea goes and it isn’t all nailed down yet, the generative ones start building it in their heads, and once they’re building it in their heads they’ve joined. The proactive engineering questions weren’t a sign the demo had gaps. They were the demo working exactly as it should, pulling other people into the work.
I think we get this backward when we prep. We sand a demo down until it’s seamless, anticipate every objection, close every loop, because we’re afraid of the question we can’t answer. But a seamless demo gives the audience nothing to do but watch. An open one gives them somewhere to step in. The goal isn’t to be impressive, it’s to be contagious, to get the idea running in heads that aren’t yours so the work keeps moving after you leave the room.
So the question I’m asking before the next one isn’t “is this tight enough to impress.” It’s “does this leave the right doors open, and are the most useful next questions sitting right where someone else can pick them up.”
The teachable part
A demo’s job isn’t to impress, it’s to spread. The best ones don’t arrive finished and airtight, they arrive working but open, with the obvious next questions left visible for other people to pick up. A seamless demo gives the audience nothing to do but watch. An open one gives them somewhere to step in, and once they’re building the idea in their own heads, they’ve joined the work. Prep for contagious, not impressive.