The Great Divorce
The Great Divorce tells of separation, contrast. In it, Lewis presents the absolute impossibility of trying to reconcile Heaven and Hell.
The book follows the journey of a group of people from the "Grey City" (Hell or a place that will soon become Hell) to the "High Countries" (Heaven). There, they will have a generous chance to start a journey that will lead them to God. However, scene after scene, we see that the condemned themselves abdicate their entry into Heaven because of petty reasons, such as wounded pride or old enemies. One by one, they all return to the bus, crying out their pride in staying in the "Grey City". Lewis shows us that no one can get to Heaven taking their hellish baggage with them. There is a rupture, an unbridgeable chasm between the two.
From this dominant concept, the idea of the cover emerged, contrasting Heaven with Hell. On the cover itself, there is an image of Heaven and on the back cover, an image of Hell. Also, in the cover there is a cutout: in addition to the natural separation between the images of Heaven and Hell, provided by the spine of the book, a "rip" reinforces the theme, letting the reader glimpse the darkness of the abyss.
The image on the back cover (which appears in the chapter openings) is from another scene from Hell in the Divine Comedy, and it admirably shows the dilemma many convicts face in the book, trying to choose between self-pride and salvation, between "reigning in the Hell" and "Serving in Heaven".