How do you get new ideas? That you do by analogy, mostly, and in working with analogy you often make very great errors. It’s a great game to try to look at the past, at an unscientific era, look at something there, and say have we got the same thing now, and where is it?
-- Richard Feynman, The Meaning of It All: Thoughts of a Citizen-Scientist, page 114
-- Richard Feynman, The Meaning of It All: Thoughts of a Citizen-Scientist, page 114