I wasn't sure whether or not I should be able to include number 17 on my book challenge list because it is technically a children's book... and also very short.
I thought it was a beautifully written children's book that grappled with some not-specific-to-childhood issues. It's clear why adults enjoy it just as much, if not more, than children do.
I decided a few years ago that, every year for their birthdays, I would give my youngest cousins (now ages 6 and 2) a book that either I really enjoyed at that age, or one that I happened to enjoy later that is appropriate for their current age. If you want to know whether I'd recommend it, I plan to give one of them this book for one of their upcoming birthdays. So yes, I do recommend it, and enthusiastically!