How does Iris Murdoch use imagery in A Severed Head?

Imagery:

"There was a desperate fierceness in her manner, but there was also fear, fear of my reactions. It was the fear which began to convince me and I felt the first touch of nightmarish terror."

"In the creamy white smock, self-consciously old-fashioned, my brother seemed dressed to represent a miller in an opera."

"With a choking sigh more profound than silence the fog enclosed me. I opened my mouth to call out to her, but found that I had forgotten her name."