Decline of the American dream - The significance of past dreams represented by the green light. This metaphor helps to characterise both Gatsby's struggle & the American dream. The American dream eluded people, yet they would still strive for it.
Social class - The characters are driven by money, status & consumer culture. The division between East egg & West egg shows that even among the rich there are class divisions.
Geography - East egg represents the old aristocracy, West egg the newly rich, valley of…