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 wrestling, telling jokes, and scientific experiments (hanging a pendulum and dominoes) creates a warm, reminiscent picture of past times.

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.