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At the enchanted metropolitan twilight I felt a haunting loneliness sometimes, and felt it in others – poor young clerks who loitered in front of windows waiting until it was time for a solitary restaurant dinner – young clerks in the dusk, wasting the most poignant moments of night and life. (3.156)
You know all those clichés about big cities being lonely places? Fitzgerald thought so, too. He sees New York as being like one of Gatsby's parties, only less glamorous: full of people, and full of loneliness.