I never read it as a child and that's just sad because it is so much fun! I want to dress in a wolf suit and sail away to a magical island forest with lots of impossible creatures who make me Queen!!! I've always wanted to be an autocrat and have a wild rumpus, making lots of noise and mayhem.
The pictures are beautiful. My favourite is when his room has been transformed - "his ceiling hung with vines and the walls became the world all around...".
The book teaches imagination and how you can have fun, even when you're alone - well, until you get hungry.