Final answer:
Fitzgerald uses contrasting imagery to highlight the differences between West Egg and East Egg in terms of luxury and humility, representative of the class divisions during the Roaring Twenties.
Step-by-step explanation:
In this excerpt, Fitzgerald is contrasting the two areas that he lived in, specifically West Egg which is described as 'less fashionable' and East Egg which is portrayed as more luxurious. The use of ostentatious imagery in describing East Egg and plebeian imagery in describing West Egg creates a stark contrast between the two. This stark contrast reflects the polar moods of luxury and humility that define the class visions of the Roaring Twenties.