I am a 21 year old adult and I bought this book for myself. The illustrations are so gorgeous that I was unable to walk out of the store without it. Regrettably Amazon doesn't have a 'look inside' feature, but the art on the front is the same style found within; whimsical, free-flowing lines, with a very watercoloured feel to them.
As other reviewers have said, this is a very short read. If you're only reading the words. But for the nature of this book (as it is intended for children, though all can enjoy it) one should find themselves spending a few minutes staring at the beautiful illustrations, scenery, and over all atmosphere of it.
I wish I could share with you one of my favourite pages, but it's ten pages into the book, "I go where the wind steers me... and I let the world reveal itself." There are teensy tiny little messages like that (go outside, explore, stay curious) throughout the book (hidden in illustrations or the words) to inspire those of all ages.
This review probably doesn't make it sound as fantastic as it is. So: Get the book. Your shelves will thank you.