I basically got this book to see if there were any writing prompts to use in a classroom. There are many, but most of them are in basic textbooks anyway. If you're new to books on creativity - this will be good for you. If you've explored it already, it may be a bit remedial.
I only give this three stars because it is too much like other books on exercising your creativity that I've read in the past. But, if you don't own any other books on this subject, you might find this is just the ticket for expanding your abilities.
Here's an example of the exercises in the book: "Think like an alien." Here, you are asked to examine flowers, trees, everything on Earth as if you dropped in from a flying saucer. A good idea. How would you describe a pansy to someone who'd never seen one? How would you draw it?
I prefer other volumes I already own (Carbonetti's "Making Pearls" and The Artist's Way, in particular) to Pencil Dancing. But, if you want a somewhat whimsical set of exercises and musing on creativity, this book may just do it for you. It didn't do it for me, but, because the creative process is so different for each individual, you may be entranced. How to judge? If you own other such books and like them a lot, this may not be a good choice. If you like fantasy and directed imagery, and some of the other creativity books seem a bit dull, you will probably like "Pencil Dancing."