​​Bioluminescence is a natural phenomenon where organisms make their own light. Bioluminescent organisms, like bacteria, fungi, jellyfish, fireflies, have light emitting compounds called luciferin, which produces light when it reacts with oxygen, catalyzed by an enzyme called luciferase. 

Here I used bioluminescence as a metaphor for hope and the Jungian concept of integrating with the shadow self.