How does Asne Seierstad use imagery in The Bookseller of Kabul?

Imagery:

"Burka women are like horses with blinkers: they can look only in one direction. Where the eye narrows, the grille stops and thick material takes its place; impossible to glance sideways. The whole head must turn; another trick by the burka inventor: a man must know what his wife is looking at...."

"The letters cause her to dream. About another life. The scribbles give her thoughts a lift and her life some quivering excitement. Both are new to Leila. Suddenly there is a world inside her head she never knew existed...."