How does William Styron use imagery in Sophie's Choice?

Imagery:

"'Oh, we're going to be the best of friends!' she trilled over the train's rackety noise, and she gave my arm a tight squeeze that was certainly not flirtatious but contained something in it more than, well, casual. Call it the reassuring squeeze of one who, secure in her love for another, wished to admit a new-found companion into the privileges of her trust and affection."

"She told me that she had never been bored. She was determined to put behind her the madness of the past, or as much as a vulnerable and memory-racked mind permitted, and so for her the huge city became the New World in spirit as well as fact. Physically she sensed that she was still badly run-down, but this did not prevent her from partaking of the pleasures around her like a child turned loose in an ice cream parlor."