Gianni Rodari and Bruno Munari have always paid great attention to the world of children, sharing the purpose of setting images and words free, and making us discover the pleasure of invention, imagination and creativity. Bringing together seemingly distant or even opposite elements, and coming up with unexpected solutions and combinations, they gave new meanings to letters and signs. Their creative paths run parallel to each other for years, and found their meeting point in many books such as Filastrocche in cielo e in terra (“Nursery rhymes up in the sky and down on earth”), La torta in cielo (“The cake in the sky”), Il libro degli errori (“The book of mistakes”), Il pianeta degli alberi di Natale (“The planet of Christmas trees”).