Final answer:
Nick's perception of Daisy shifts from fascination to a more critical view as he sees her materialism and emotional detachment, which reflect the moral decay of the 1920s upper class.
Step-by-step explanation:
Nick Carraway's perception of Daisy Buchanan in The Great Gatsby evolves throughout the novel. His initial fascination and intrigue become mingled with disappointment and critique as Nick observes Daisy's life and behavior. Her materialism, emotional detachment, and the encompassing hollowness of her existence in the upper-class society of the 1920s ultimately sour Nick's view of her. The story's social commentary on the American Dream is embodied in Daisy's character, who is seen as both a victim and a perpetuator of the era's moral decay.