Usually it's a pretty calculated, sustained, and slow process by which you develop something. The effect can be one of spontaneity, but that's part of the artistry.
I think the real test is to plan something and be able to carry it out to the very end. Not that you're always enthusiastic; it's just that you have to get this thing out. It's not done with one's emotions; it's done with the head.
I think the popular concept of the artist is a person who has this great passion and enthusiasm and super emotion. He just throws himself into this great masterpiece and collapses from exhaustion when it's finished. It's really not that way at all.
An actor can do a play on Broadway for three years. Every night he's expressing the same emotion in exactly the same way. He has developed a technique to convey those feelings so that he can get the ideas across. Or a musician may not want to play that damn music at all, but he has a booking and has to do it.
