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 about past activities like Greco - Roman wrestling, telling jokes, and the pendulum - domino experiment evokes a nostalgic tone by reminiscing about good - old - days.

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.