Gatsby's green light: Located at the end of the Buchanans' dock, this green light represents Gatsby's ultimate aspiration: to win Daisy's love. Nick's first vision of Gatsby is of his neighbor's trembling arms stretched out toward the green light . Later, after Daisy and Gatsby's successful reunion, a mist conceals the green light, visibly affecting Gatsby. Nick observes, "Possibly it had occurred to him that the colossal significance of that light had now vanished forever....Now it was again a green light on a dock. His count of enchanted objects had diminished by one" . This image suggests Gatsby realizes he must face the reality of Daisy, rather than the ideal he created for her.
The green light is a multi-faceted piece of symbolism in the book. It's most obvious interpretation is that the light is symbolic of Gatsby's longing for Daisy, but that is too simplistic. Daisy is part of it, but the green light means much more. Gatsby has spent his whole life longing for something better. Money, success, acceptance, and Daisy. And no matter how much he has he never feels complete. Even when he has his large house full of interesting people and all of their attention, he still longs for Daisy. He created in his dreams for the future a place for her, and he will not be content to have that gaping hole. So the green light stands for all of Gatsby's longings and wants. And when Nick talks about the green light at the end of the book he says "It eluded us then, but that's no matter- tomorrow we will run faster, stretch our arms out farther...." . He connects the green light to all people. Everyone has something that they long and search for that is just off in the distance.