When a section of fence around our house blew down in a howling March wind, my first reaction was to blame the man who built it for me only a few months before. On further reflection, I knew the fault was mine. As the fence was nearing completion, I told him there was no need to replace four existing posts from the previous fence with new ones set in concrete. “Just attach the new fence to the old posts,” I said. “It will be fine.” It was—until the winds came.