Cumulative Record. Chapter 25: Creating the Creative Artist. Quote 20

A person who, as we say, lives for art, for whom art is the most important thing in the world, is not so much one who finds art reinforcing as one who has enjoyed a favorable history of painting or looking at pictures. The technique with which a dishonest gambler “hooks” his victim shows what needs to be done. The first reinforcements must be quick and easy, but the average amount of behavior demanded for each reinforcement must then slowly increase. Eventually the behavior is maintained for long periods of time, possibly without any reinforcement whatsoever. (p. 388)