Consider the lowly umbrella: A mundane object, often cheaply made and inexpensively acquired, and with a singular habit of failing to do the job it was designed for. In anything but a light rain that falls straight down, an umbrella—even one of those big golf umbrellas—will keep very little of you dry. And if you’re sharing it with someone, forget it. As the Police sang many years ago, “It’s a big enough umbrella, but it’s always me that ends up getting wet.” It’s a wonder anyone uses the dadgum things at all.