Why does Metaphor matter?

It's the last part of this talk that relates to the title.

So, for example, when trying to give advice, do you ever wonder about telling them stories of other people who have tried things before working? Is this why great thinkers like Socrates taught with metaphor?

The rest is interesting too.

Mirror therapy was described by Dr Milton Erickson (father of Medical Hypnosis) in stroke patients in the 1960s / 70s.