“About that. As a matter of fact you needn’t bother to ascertain. I ascertained. They’re real.”
When Owl Eyes looks over the literature collection, he is bringing to attention Gatsby’s wealth. Owl Eyes also demonstrates an interest in Gatsby, which is something that a lot of the other guests at his parties don’t have. They simply go for the party without caring about the host.
That he questions the veracity of the books is interesting. It’s hard to imagine books that aren’t real, but again this speaks to affluence — as not many were able to accumulate books cheaply
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