How does Colson Whitehead use imagery in Sag Harbor?

Imagery:

"What happened in the house stayed in the house, caroming off the walls and furniture and us, until it was absorbed or forgotten."

"No one cares about what goes on in other people's houses. The grubby dramas. It was just us. The soundstage was empty, the production lot scheduled for demolition. They'd turned off the electricity long ago. We delivered our lines in the darkness."