How does Anne Tyler use imagery in The Accidental Tourist?

Examples of Imagery:

"black branches scrawled on a purple night sky"

"sitting up wide awake fending off his thoughts."

"..... city spread like a glittering golden ocean, the streets tiny ribbons of light, the planet curving away at the edges, the sky a purple hollow extending to infinity."

"murky alleys and stairwells full of rubbish"

"young men drinking out of brown paper bags"