How does Neil Gaiman use imagery in The Sandman: The Kindly Ones?

Imagery:

"Imagine that you woke in the night and rose, and seemed to see before you another person whom slowly you perceived to be yourself. Someone had entered in the night and placed a mirror in your sleeping place, made from a black metal. You had been frightened only of your reflection. But then the reflection slowly raised one hand, while our own hand stayed still... A dark mirror..."

"Each facet catches the light in its own way. It glints and sparkles and flashes uniquely. It would almost be possible to believe that the facet was the jewel; not just a tiny part of it. But, then, as we move the jewel another facet catches the light..."