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Lewis Marshall
Worldbuilding
A city with border customs and quarantine rules is never just a city. It becomes a place where every gate, dock and market stall has its own idea of what counts as clean, legal or cursed.

That sort of thing changes trust fast. People stop asking “is this true?” and start asking “who stamped it?” or “which quarter says so?” A seal can matter more than a witness. A dockside inspection can carry more weight than a priest.

Useful detail, too. It gives you a reason for petty rivalries, black markets and very polite lies.
Jamie Palmer
The awkward bit is that the rules don’t have to be consistent to be powerful. In practice, inconsistency is often the point. One quay gets waved through, another gets searched to pieces, and everyone learns who the real favour is for.

That sort of system breeds memory. People remember who was delayed, who was let past, who paid to avoid questions.
Beth Lane
Quarantine also gives you a lovely excuse for bureaucracy to become theology. Once “dirty” and “dangerous” are treated as the same thing, people stop arguing about evidence and start arguing about permission. That’s where cities get nasty in interesting ways.

It also creates a class of people who live by knowing which rules are official and which ones are merely enforced. Those aren’t always the same thing.