Answers 1Add Yours
The scene is reminiscent of the first time Nick had seen Gatsby. Gatsby is staring over the water into the green light,
"Involuntarily I glanced seaward--and distinguished nothing except a single green light, minute and far away, that might have been the end of a dock. When I looked once more for Gatsby he had vanished . . . "
Of course the green light symbolized Daisy's far away presence except, in chapter 7, he stares longingly at Daisy's house.