If you’ve ever read any Greek mythology or the Bible or watched Star Wars, you have experience with the “hero’s journey,” the concept—identified by the author and philosopher Joseph Campbell—that most great epic stories follow a similar narrative arc: a hero has a crazy idea; people doubt her; she leaves the village to pursue her vision, faces untold obstacles, falls into an abyss, barely escapes death, but manages to come out the other side with whatever she was looking for and continues on her journey to an eventual triumphant return.