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What is Nick describing in this quote? "....he stretched out his arms toward the dark water in a curious way, and, far as I was from him, I could have sworn he was trembling. 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 him he had vanished, and I was alone again in the unquiet darkness."
The first time he saw Gatsby/Gatsby's obsession