The main aim of the paper is to find some deeper meanings of Jan Brzechwa’s trilogy on Mister Kleks. The author focuses on metaphor of a library as a gateway to a fabulous world and on a metaliterary dimension of the work, showing that it can be read as a kind of Künstlerroman (and Bildungsroman). She also seeks sources for Brzechwa’s invention, analyzing each part of the novel from this point of view. The science-fiction, utopist and parodist contexts of the novel are also taken into consideration.