Final answer:
The contrast in views between Walter Mitty and the reader generates sympathy for Mitty and adds humor to the story as he acts out his fantasies unnoticed by those around him.
Step-by-step explanation:
The contrast between Walter Mitty's perception of himself and the reader's perception is a crucial element in "The Secret Life of Walter Mitty." Through Mitty's vivid daydreams, readers gain insight into his aspirations and the escapism he seeks from his mundane life. This contrast does not build suspense in the story or inject tension about his wife discovering his unhappiness. Instead, it creates sympathy for Mitty and adds humor to the story as there's a disconnect between his fantasies and reality, creating absurd and comedic situations as he navigates between his imagined adventures and his less exciting real life.