Now imagine further that we can see him, which of course is a pretty tall order, but necessary since this is a very rough analogy.

"Plant" was a rough analogy, but it would do.

A rough analogy is the relationship between a mother and a fetus.

That's a rough analogy of how mail travels over the Internet.

Federal officials now say the intelligence agencies were skeptical, reasoning that too much was being made of a foreigner's rough analogy.

Now imagine that all this happens in fractions of a second - a rough analogy to packet switching.

He used to give that rough analogy about the sea freezing.

A rough analogy would be a pot of spaghetti.

"A rough analogy is putting handcuffs on a person so their arms can't function properly," he added.

There is a rough analogy to the human brain, which has no sensory nerves within itself.