How does Lila Perl use imagery in Four Perfect Pebbles: A Holocaust Story?

Imagery:

"The stench of burning flesh from those open pits remains in my nostrils to this day." (Chapter 5, 68)

"We wanted to stay as close to each other as my four perfect pebbles, the little stones that I could hold in the palm of my hand." (Chapter 7, 95)

"Mama, Albert and I were part of the huge crowd that started to gather as early as five a.m., all of us craning our necks for a first view of the Statue of Liberty. When the tall figure of that longed-for symbol of freedom appeared, I became too choked to speak." (Chapter 8, 112)