How does James P. Carroll use imagery in An American Requiem?

Visual Imagery:

"The next day, my mother arrived at the nursing home with an entire box of crayons and a large pad of construction paper. She sat beside my otherwise uncomprehending father as he filled page after page with the one word 'Mary.' This went on for some days until, having forgotten again and once more in the grip of hyperorality, he put the crayon in his mouth. But my mother had her pages, his last word, and the absolute treasure of her life."