I just finished drawing, scribling, underlining and reading The Creative Habit: Learn It And Use It For Life by Twyla Tharp. Interestingly enough, I was directed to this book by Patricia Ryan Madson, the author of improv wisdom: Don't Prepare, Just Show Up. The greatness of The Creative Habit is that it is able to put to words the process of creativity; it never slips from the message that it is work.
It is truly important in understanding the principle of creativity--work is involved and expected--while applying it to many different fields. The book acts to spark new ideas, cement old ones and get individuals to understand the creative work ethic.
For me, the most telling story came in Twyla's story about Buster Keaton--an actor and comedian I had previously not thought of-- and his approach to comedy. Simply put "he [Buster] had an economy of purpose and execution." Keaton worked through his comedic sketches such that there was no filler.
That is the point!!