The author believes that there is a problem with the way society treats boys and girls, as if they have to be different in some way. For example, we often tell boys to play with trucks and girls to play with dolls. This kind of thinking limits children and makes them feel like they can't do things outside of those gender roles. In the story, the author shows us what happens when a child (like "X") grows up without anyone knowing if he is a boy or a girl. This allows the child to grow up without being pushed into a specific gender role.