Are there any references in chapter 17 to light or darkness?

Without naming the girl as Maggie, the reader assumes it is Maggie. The author describes the experience of a night in the life of a girl on the streets. Loneliness is a prominent theme in this chapter. The girl walks alone, inviting men to purchase her services but with no takers, she continues to be alone. The author uses shadows and light to illustrate the isolation and rejection.

In the mingled light and gloom of an adjacent park, a handful of wet wanderers, in attitudes of chronic dejection, was scattered among the benches. ch 17