How does nick respond to this confusion and what does this remind you of? in the great gasby

The chapter opens with a description of Gatsby’s parties and his hospitality. Nick is invited and attends, where he meets Jordan again, and has several conversations with other guests. Some of the guests gossip about Gatsby and the origins of his wealth. Jordan and Nick search for Gatsby, ending up in the library, where they meet a man with owl-eyed spectacles who enthuses about the books being real. 

It shows that the milk is like life to the boy