Possibly it had occurred to him that the colossal significance of that light had now vanished forever. Compared to the great distance that had separated him from Daisy it had seemed very near to her, almost touching her. It had seemed as close as a star to the moon. Now it was again a green light on a dock. His count of enchanted objects had diminished by one.

– F. Scott Fitzgerald

The Great Gatsby, Chapter 5. The green light at the end of Daisy’s dock represented Gatsby’s dream of a new life with Daisy. Now he had realized that dream, he had Daisy’s love.