Mac Barnett has written a children's book that is "THE BEST" according to my 6 and 8 year old girls! Extra Yarn is such a fun picture book - the story of Annabelle and her ball of yarn that just never stops! She knits for herself, her family, her friends, her pets, other animals and then just keeps knitting for trees, houses, and even trucks!! It isn't until the Archduke comes to find the secret to the yarn that we, as readers, get to see what is truly inside that secret yarn box! SO fun - and Jon Klassen's illustrations are MAGNIFICENT - check out his use of limited color - I just LOVE it!!