How does Philip Yancey use imagery in The Jesus I Never Knew?

Imagery:

"Nine months of awkward explanations, the lingering scent of scandal—it seems that God arranged the most humiliating circumstances possible for his entrance, as if to avoid any charge of favoritism. I am impressed that when the Son of God became a human, he played by the rules, harsh rules; small towns do not treat kindly young boys who grow up with questionable paternity," Chapter 2, p. 32.

"Unimaginable, the Maker of all things shrank down, down, down, so small as to become an ovum, a single fertilized egg barely visible to the naked eye, an egg that would divide and redivide until a fetus took shape, enlarging cell by cell inside a nervous teenager," Chapter 2, p. 36.