Question

which line from extremely loud and incredibly close reveals a nostalgic tone?
even after a year, i still had an extremely difficult time doing certain things, like taking showers, for some reason,
and getting into elevators, obviously
a lot of the time id get that feeling like i was in the middle of a huge black ocean, or in deep space, but not in the
fascinating way
its just that everything was incredibly far away from me. it was worst at night. i started inventing things, and then i
couldnt stop, like beavers, which i know about.
we used to greco - roman wrestle on the floor in there, and tell hilarious jokes, and once we hung a pendulum
from the ceiling and put a circle of dominoes on the floor to prove that the earth rotated

Explanation:

Nostalgia involves looking back fondly on past events. The line "We used to Greco - Roman wrestle on the floor in there, and tell hilarious jokes, and once we hung a pendulum from the ceiling and put a circle of dominoes on the floor to prove that the earth rotated" uses "used to" which indicates past activities. The description of fun and interesting past actions (wrestling, telling jokes, scientific experiment) shows a fond remembrance of the past.

Answer:

We used to Greco - Roman wrestle on the floor in there, and tell hilarious jokes, and once we hung a pendulum from the ceiling and put a circle of dominoes on the floor to prove that the earth rotated.