Question

Explain why "the colossal significance of that light had now vanished forever" and why gatsby's "count of enchanted objects had diminished by one."

Answer 1

Because he had lost Daisy he realizes that the importance and significance of his dream has died a little bit. She chooses Tom, even after all he has done for her, so her place as an enchanted object in his life has dulled and disappeared. It's a sad realization, but justified by what has happened.