In Alkis Zei's books, the child-heroes use humor to entertain seriousness and the drama of intense moments, as children cannot tolerate "seriousness for too long," in order to make learning more enjoyable and entertaining, etc. In the novel "Petros' Great Walk," during the scene where Petros and Antigone's grandfather secretly becomes a beggar, behind the subtle children's humor lies seriousness. Behind the cheerfulness it creates, a tragic tone faintly shines through. Seriousness coexists with the funny and cheerful. Antigone's humor aims to entertain the seriousness and drama of the moment but also to mock the grandfather.