How could you find the hidden rules where you work?

“No,” says Freeman ibn Solomon. “Law is error, you see. It’s an attempt to write down a lot of things everyone ought to know anyway. We don’t have that. Every one of us is expected to act within the constraints of right thinking, and to be prepared to stand by the consequences of those actions. That is,” he adds, “not as comfortable a position as you might think.” And he takes another sip of his whisky.“

Nick Harkaway, The Gone-Away World

This is how most cultures, groups and organisations work. We have unwritten rules and laws that people automatically should know and follow. We might even punish people for disobeying them. Many we are not even aware of, and we only notice them when someone does something that is not allowed. You have to talk about the hidden rules and norms with new colleagues, or you could just leave this person to try to figure it out through trial and error.

How could you find the hidden rules where you work?