What are the motifs in The Baron in the Trees by Italo Calvino?

Love is a motif in the book. There are a number of love relationships recorded in this story. There is the love of brothers, the love of family, the love of self, romantic love and love of country, and each story has a lesson about its type of love. Concerning love between brothers, Biagio learns that loving his brother does not necessarily mean he has to be his constant shadow or companion, but that they can go on to live their own very different lives and still help and confide in each other.