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In some living systems it's very easy to see the membranes as they map one-for-one with the very things we see.

Michael realized that for a self-organizing resilient currency network to form, there had to be a self-declared boundary system by which currencies and accounts in those systems could be declared and named, such that they would be visible and known to the entire network, but also such that any such group had it's own autonomy and control within that domain. This is a profound insight: naming is one of the key elements that creates the membrane of the social organism. Names are part of what creates the boundary that make a social organism distinguishable as an independent whole.

The flowplace design included the notion of a "circle," which was a way to group users and currencies. The circles were completely separate from the currency network addresses (which we were now calling wallets). We conceived of circles as providing a context for action. So any group that wanted to use free currencies to build wealth together, could come to the flowplace, and start by creating a circle, and a bunch of currencies that it would use to measure it's wealth.

When you have such circles, immediately you need to address the "security" questions of who gets to add new members into the circle. And then also the question of who gets to create currencies in a given circle, and so on. So I sat down to code these "administration" features into the flowplace, when it hit me that the meta-currency infrastructure we were using to create the currencies in the flowplace, was exactly what I needed to implement these permissions structures for the circles

Well, the meta-currency infrastructure provides a language (XGFL) for creating those formal systems, and in the flowplace I'd already used it to create some trade, performance metric, and reputation currencies.

I saw that I could use this same language to specify the permissions that participants of the circle have in regards to the currencies that the circle uses, and that that very specification could simultaneously serve as a naming, i.e. a mapping, between people, currencies and roles in the context of the given circle.

we realized that the membrane currency also has a broader naming function in that it is also responsible for creating names for all the currencies in use by the circle, be they currencies that are created by circle for internal use only, or be they currencies created externally. The membrane currency brings such currencies "inside" the circle, by virtue of giving them a local name.

It is a membrane, which is the systemic component that both separates and connects the organism from its environment

The membrane is not so much a static physical barrier, as it is an active process that mediates between "inside" and "outside."