35. Having a noticeable border may be a prerequisite to the establishment of any legal regime that can claim to be separate from pre-existing regimes. If someone acting in any given space has no warning that the rules have changed, the legitimacy of any attempt to enforce a distinctive system of law is fatally weakened. No geographically based sovereign could plausibly claim to have jurisdiction over a territory with secret boundaries. And no self-regulatory organization could assert its prerogatives while making it hard for members and nonmembers to tell each other apart or disguising when they were (or were not) playing their membership-related roles.