He rolled over on his stomach and looked down at the panes of glass scattered through the darkness below; they caught reflections from somewhere and looked like phosphorescent, self-generated springs of light rising out of the ground.
There are no more uses of "phosphorescence" in the book.
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She loves to swim in the ocean on nights when phosphorescence shines in her wake.
The phosphorescence is caused when movement in the water causes plankton to release tiny pulses of light.