That is the green light. Next, the eyes of Dr. Eckleburg are from a billboard that looks over Wilson's garage. The eyes are always mentioned whenever Nick is there. They look over the situation, objectively, but offer a kind of judgment on the characters and their actions. They are placed near Wilson's because that is where some of the most selfish acts take place, like Myrtle's death and Tom's affair. All of these crimes go unpunished. So they eyes look on and remind the characters of the guilt that they forget to have for what they have done. The third symbol is East and West Egg, which is a barrier between class and social standing. East and West Egg act as a symbol of this in its physical makeup. Tom and Daisy live on East Egg, which is far more refined and well bred. Nick and Gatsby are on West Egg, which is for people who don't have any real standing, even if they do have money. The barrier that the water creates between these worlds in symbolic of the barrier that keeps these people apart from one another and from much of what they want. .
Second, there are many themes that Fitzgerald uses to make the novel a classic. The word that can sum up many of the themes in the book is position. The word encompasses themes like class, wealth, social standing, and others. Gatsby's whole life is spent trying to attain money and status so that he can reach a certain position in life. That is what motivated him to move to West Egg, make money by any means necessary, and strive to win Daisy back. There is a position in life that he yearns for and will do all that it takes to achieve it. Daisy and Tom on the other hand show how people can use their position to look down on others and live their life carelessly. It is this superior mind set that allows Tom to cheat on his wife and allows he and Daisy to run away from the death of Myrtle. They need not worry about such things because they are too good for it.