There is an unspoken agreement happening inside every library on the planet and nobody signed anything to make it official. People shuffle in, hunch their shoulders like they're carrying invisible secrets, and suddenly forget how to use their regular voices. Whole conversations happen in half-breaths and dramatic eyebrow raises.
The funny thing is, libraries stopped being strictly silent a long time ago. Most of them have coffee shops inside now. Actual espresso machines. The irony is almost too good. You can get a flat white twelve feet from the fiction section and nobody bats an eye.