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"Your place looks like the World's Fair," I said.
"Does it?" He turned his eyes toward it absently. "I have been glancing into some of the rooms. Let's go to Coney Island, old sport. In my car."
"It's too late."
"Well, suppose we take a plunge in the swimming-pool? I haven't made use of it all summer."
"I've got to go to bed."
"All right." (5.3-8)
Gatsby has a house full of people, and all he wants is one friend to go swimming with him. Talk about lonely.