The Guide
Adams tries to convey how long and comprehensive the Guide is by writing, "if it were printed in normal book form, an interstellar hitchhiker would require several inconveniently large buildings to carry it around in" (26). This effective image suggests how much is in the Guide and how much there is to learn about the rest of the Galaxy.
Magrathea
Adams does an effective job at suggesting how mysterious, unique, and improbable Magrathea is by creating an image of nothingness and vastness but then revealing a "red star the size of a small plate" (113) creeping across their view. It is a subtle but impactful image that connotes Magrathea's singularity.
The Wall
Through Arthur's disbelief and lack of comprehension about how large the Wall is in Magrathea's planet-building area, readers get an image in their head of the size and abilities and power of Magrathea to create planets for patrons. Arthur's limited brainpower grasps at the infinite through the "paralyzingly vast and sheer" Wall(160).
Absurdity of the Universe
The hilarious and improbable image of the mice treating the humans/humanoids to lunch creates a picture of how absurd the universe actually is, and how we cannot take anything for granted. The mice are incredibly small and what the reader no doubt considers insignificant, yet they host men and women with delicious food, unprepossessingly perched on the table itself.
