How does Paul Fleischman use imagery in Whirligig?

Imagery:

"Birds don't live alone, I told myself. They live in flocks. Like people. People are always in a group. Like that little wooden band. And whenever there's a group, there's fighting. If the people in the group get along, maybe they make good music instead of arguing....That's how life is. I stared at that marching band. Then I got in the car and drove home."

"But his clacking, flashing, jingling memorial would give off sound and color all year, holding back the tide of death. It was a kinetic gravestone, painted in ever-blooming greens and yellows and reds. Lea would not be swallowed up."