“But I didn’t call to him, for he gave the sudden intimation that he was content to be alone – 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 a dock.” (21)
What does this green light represent, in this quote and throughout the rest of the book?