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The sail symbolizes Gatsby's past because when he sees it he stares at it for a couple seconds. He doesn't say anything but is probably thinking about Dan Cody's yacht

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Daisy's daughter symbolizes that Daisy changed since the last time that she saw Gatsby and things will never be the same

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Daisy's voice symbolizes wealth and the American dream and how she has everything everyone wants

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The heat the day that Tom finds out Daisy had been having an affair symbolizes the tension between everyone

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Wilson's sickness symbolizes betrayal because he found out that Myrtle had been having an affair but he doesn't know with who