A Calvino's excellent 'divertimento'. Shadowing the Philosophical novel of the Enlightenment period Calvino imagines that a guy (the Count Cosimo) not happy with the family and world environment decides to live in the trees (Cosimo is twelve and it is running the year of 1767) During a period of 53 years since Cosimo's jumping we will follow the development of a personality that will be always in touch with his epoch. Through this period the rebel has correspondence with Diderot, Voltaire a longing for Rosseau theories and even a short visit of Napoleon.During the narrative Calvino, always with a unfleeting sense of humour, entertains us with the adventures of Cosimo: his interactions with the inhabitants of his country,his survival and self improvement strategies and his love affairs. The Enlightenment issues are expressed: it is at the same time hilarious and pertinent the romantic criticism to this period that is present at the lover affair between Cosimo and Viola (his first and unforgettable love). All the novel is punctuated with an empathy for the main characters and their beliefs but added with a salt of irony that the two hundred years of distance implies. Maybe not the best of Calvino but anyway a very amusing and interesting narrative.