This is a fabulous book! Cosimo decides after an argument with his father that he will go and live in the trees and not come down! In fact he is true to his word (how many of us made equally silly promises when we were young and couldn't keep them?). He manages to live a full and useful life in the trees, preventing fires spreading, hunting food for himself and even having love affairs. Here is a lesson in sustainability and living closer to nature, a plea for tolerance for everyone who chooses to live their lives differently and a totally entertaining read.
It's by Calvino, of course its brilliant!