If you know about this trait, you can understand a lot of puzzles about human behavior, like why artists are so different from accountants. You can predict what kinds of books they like to read, what kinds of places they like to travel to and what kinds of food they like to eat. Once you understand this trait, you can understand why anybody would eat at Applebee’s, but not anybody that you know.

This trait also tells us a lot about politics. The main researcher of this trait, Robert McCrae, says that “Open individuals have an affinity for liberal, progressive, left-wing political views …” They like a society which is open and changing, “… whereas closed individuals prefer conservative, traditional, right-wing views.”