How does Lauren Oliver use imagery in Delirium?

Examples of Imagery:

"We'll be adults—cured, tagged and labeled and paired and identified and placed neatly on our life path, perfectly round marbles set to roll down even, well-defined slopes."

"This music ebbs and flows, irregular, sad. It reminds me, weirdly, of watching the ocean during a bad storm, the lashing, crashing waves and the spray of sea foam against the docks; the way it takes your breath away, the power and the hugeness of it."