How does Alexandra David-Neel use imagery in My Journey to Lhasa?

Imagery:

"Ever since I was five years old, a tiny precocious child of Paris, I wished to move out of the narrow limits in which, like all children of my age, I was then kept. I craved to go beyond the garden gate, to follow the road that passed it by, and to set out for the Unknown."

"The Dokar Pass now stood before us, most impressive against a gray evening sky. It is a depression in a gigantic barren range, whose Cyclopean slopes sag like cables outstretched across rivers to serve as bridges. The knowledge that it marks the threshold of the guarded region added to the sternness of its aspect."