What is one theme of symbol of the novel?

THere are many themes in this novel. One major one is decay. Decay is a word that constantly comes up in The Great Gatsby, which is appropriate in a novel which centers around the death of the American Dream. Decay is most evident in the so-called "valley of ashes." With great virtuosity, Fitzgerald describes a barren wasteland which probably has little to do with the New York landscape and instead serves to comment on the downfall of American society. It seems that the American dream has been perverted, reversed. Gatsby lives in West Egg and Daisy in East Egg; therefore, Gatsby looks East with yearning, rather than West, the traditional direction of American frontier ambitions. Fitzgerald portrays the chauvinistic and racist Tom in a very negative light, clearly scoffing at his apocalyptic vision of the races intermarrying. Fitzgerald's implication seems to be that society has already decayed enough and requires no new twist.

Symbol,

The Green Light

Situated at the end of Daisy’s East Egg dock and barely visible from Gatsby’s West Egg lawn, the green light represents Gatsby’s hopes and dreams for the future. Gatsby associates it with Daisy, and in Chapter 1 he reaches toward it in the darkness as a guiding light to lead him to his goal. Because Gatsby’s quest for Daisy is broadly associated with the American dream, the green light also symbolizes that more generalized ideal. In Chapter 9, Nick compares the green light to how America, rising out of the ocean, must have looked to early settlers of the new nation.