The level of setting in a story that's the most realistic is literal. If
you are talking about something in a literal manner, it means that you
are writing about what is going on exactly around you or in a novel. So,
what you write is indeed happening. If something is supernatural, it
cannot be realistic. Foreshadowing is a technique which authors use to
hint at what is going to happen in the future, so it's not really
realistic as it doesn't happen in real life.
