How does Robyn Davidson use imagery in Tracks?

Imagery:

One does not have to delve too deeply to discover why some of the world's angriest feminists breathed crisp blue Australian air during their formative years, before packing their kangaroo-skin bags and scurrying over to London or New York or any place...

... what I wanted to do... was to be alone, to test, to push, to unclog my brain of all its extraneous debris, not to be protected, to be stripped of all the social crutches, not to be hampered by any outside interference whatsoever, well meant or not.