How does Dean Koontz use imagery in Life Expectancy?

Imagery:

"The most arrogant, most pompous, most conceited, most overrated of them all is Virgilio, the paterfamilias, my mother's father."

"Or I wake up in the night convinced there's nothing out there beyond my window, nothing at all but a darkness, a vacuum, and I'm afraid to open the drapes and look, afraid I'll see a perfect emptiness, and that when I turn from the window, the room will be gone, too, and I'll cry out but won't make a sound, just float there with no sense of touch, no taste or smell, deaf and blind, the world gone as if it never was, me with no body that I can detect, no heartbeat I can feel, and yet unable to stop thinking, thinking, furiously and frantically thinking about what I don't have and what I want, about what I do have but want to be free of, about how I am nothing to anyone or anyone to me, never real and yet all these memories, these churning, insistent, hateful memories."