This child tells us that he is not happy with the head that he has. He thinks it is a wrong head. The parents, after listening to him, take him to a specialist, who agrees with the little one. A mysterious man dressed in black supplies him with heads in exchange for his own. The child tries several, until he finds the one he was looking for. A reindeer head, a crocodile head, a whisk head: the narrator child and protagonist of this story tells us about his disagreement with the head he has and the vicissitudes that he has to go through to find
the head with which he will finally agree: the head of a grown man, of a mathematician. This is a story of search for identity and growth, developed with fine fantasy and humor, with the wisdom of someone he has sought and perhaps already found.