@KileyArroyo, so glad to see you here my friend. Let me know if you need any help to get your bearing.
@pcawdron honored to meet you, sir. I have several works of yours on my ebook reader. 
The issue of open economies (some foreign trade, some circulation of people) is dear to my heart, and central in the way we dreamed up the architecture of Witness. In Witness we play, but it’s serious play, at least for me. I would like it to inspire myself and others to think about, for example, experimental regional policy programmes for radical innovation of territorial economies. Real-life economies have some degree of openness. It is indeed interesting to look at extreme cases, like the one you suggest (no atoms get through, only bits), and also at how the Distrikts of Witness, physically close to each other, can insulate themselves in order to maintain some kind of economic sovereignty. Ping @yudhanjaya