Sentence from a story

Gentle Readers,

I'm seeing the "Tell me about a story and get a sentence" thing popping up again. However, my brain decided to take it in the other direction. So, here's the sentence:

Tiny black hexagons reflected back the light she shone into the crack between the wall pannels.

What's the story?

ETA: Just to be clear, it's not a quote. Tell me about the story that this comes from.