The world is full of unmarked doors that some people know how to find and how to get through, and some people - by design or otherwise - do not. Aaron and Ira are thinking about ways that controlled access can both exclude and protect. When we offer each other access, what are we offering? And what are we giving up? Nascent online communities, clandestine cocktail bars, and city neighborhoods all maintain barriers to entry of one sort or another, until they don’t. And we can rarely control wh...