Recall an old joke:

A man flying in a hot air balloon realizes he is lost. He reduces his altitude and spots a man in a field down below. He lowers the balloon further and shouts, "Excuse me, can you tell me where I am?" The man below says, "Yes, you're in a hot air balloon, about 30 feet above this field." "You must be an mathematician," says the balloonist. "I am. How did you know?" "Everything you told me is technically correct, but it's of no use to anyone."