How does Anne Rice use imagery in The Witching Hour: A Novel?

Imagery:

"And now there was only the dampness here, the thick overhanging sky, and the strong knowledge that all the years of waiting were finished, that something for which he'd been prepared was about to begin."

"'That man had only begun to realize the possibilities of the present science, that new beings might be created by means of transplants, grafts, in vitro experimentation with genes and cells. You saw the scope of the possibilities. Your mind was young, your imagination enormous; you were what men fear—the doctor with the vision of a poet. And you turned your back on your visions, Rowan. In the laboratory of Lemle, you could have created new beings from the parts of existent beings. You reached for brutal tools because you feared what you could do. You hid behind the surgical microscope and substituted for your power the crude micro tools of steel with which you severed tissues, rather than creating them. Even now you act from fear. You will build hospitals where people are to be cured, when you could create new beings, Rowan."