This is brilliant. It's not even a "logic puzzle" as much as it is an engineering feat. And it's not like software engineering, where you're defining the natu

This is brilliant. It's not even a "logic puzzle" as much as it is an engineering feat. And it's not like software engineering, where you're defining the nature of the system as a whole, and then instantiating it, but more like a physical engineering discipline, in which you're juxtaposing already-existing materials against each other such that their pre-existing properties interact with each other to produce the behavior you want.