Read the passage below and consider how J.D. Salinger develops and advances the reader's knowledge of Holden in the first chapter of the novel:
I was thinking about the lagoon in Central Park, down near Central Park South. I was wondering if it would be frozen over when I got home, and if it was, where did the ducks go. I was wondering where the ducks went when the lagoon got all icy and frozen over. I wondered if some guy came in a truck and took them away to a zoo or something. Or if they just flew away.
With respect to how the author orchestrates Holden's character development, what does Salinger achieve by ascribing Holden a preoccupation with the Central Park ducks?