How does Frances Mayes use imagery in Under the Tuscan Sun: At Home in Italy?

Imagery:

"On my way out, I see a man in a sweater, despite the heat. The trunk of his minuscule Fiat is piled with black grapes that have warmed all morning in the sun. I'm stopped by the winy, musty, violet scents. He offers me one. The hot sweetness breaks open in my mouth. I have never tasted anything so essential in my life as this grape on this morning. They even smell purple. The flavor, older than the Etruscans and deeply fresh and pleasing, just leaves me stunned. Such richness, the big globes, the heap of dusty grapes cascading out of two baskets. I ask for un grappolo, a bunch, wanting the taste to stay with me all morning."

"Now the night is big and quiet. No moon. We talk, talk, talk. Nothing to interrupt us except the shooting stars."