How does Catherine Fisher use imagery in Sapphique?

Imagery:

“The Stars.

Jared slept beneath them, uneasy in the rustling leaves.

From the battlements Finn gazed up at them, seeing the impossible distances between galaxies and nebulae, and thinking they were not as wide as the distances between people.

In the study Claudia sensed them, in the sparks and crackles on the screen.

In the prison, Attia dreamt of them, She sat curled on the hard chair, Rix repacking his hidden pockets obsessively with coins and glass discs and hidden handkerchiefs.

A single spark flickered deep in the coin Keiro spun and caught, spun and caught.”