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The last time I took a session on UI, that was when I was teaching these students who had finished a course on C sharp (dot net) and now wanted to build simple UI so they can turn their just learned programming skills into visibly usable software.
Since they were on dot net, I advised them to start by building a calculator using WPF. When I say calculator, ...
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I know that you are looking for a physical analogy, but I'd say I agree with @ctrl-alt-delor about the 'link to what they already know' part.
I usually start by introducing a simple algorithm, then show how that algorithm can be parameterized. Then we move on to OO, where I discuss how an algorithm can be parameterized with not just a value, but with a ...
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I was today thinking of creating a UI heavy program. It would be some sort of logic game. A possible 1st GUI program could be lights-out. It is mostly GUI, with a little logic ( as a bonus you could explore how to do the logic, XOR, selection, modulo 2 …)
You could first model this with cards. Pupils should see that automation would make this easier. But ...
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