“Ah,” I said. “Those are the cairns.” If you don’t know what a cairn is, I am here to tell you. A cairn is a small, artful pile of stones that you see around in nature from time to time. They are a kind of folk art. Often hikers will build them as messages to other hikers yet to come. A little cairn will stand there at a branch in the trail as if to say, “Go this way for beautiful hiking!” Or “Do not go this way because of bear nesting.” It’s not clear what, really, the cairns are trying to say. And also “bear nesting” is not a thing. The cairns are less helpful than they are spooky and quiet and never really on your side.”