Umbrellas keep you from getting wet.
Why on earth would you use one?
Getting wet is the entire point. (Seth Godin)
“Serendipity. Look for something, find something else, and realize that what you’ve found is more suited to your needs than what you thought you were looking for. ”
… to place (different things) together in order to create an interesting effect or to show how they are the same or different.