Piano both her lover and her mortal enemy.”
-- Yoli as narrator (chapter 2)

Importance: Yoli is describing Elf's passion for music. Music drives Elf and is simultaneously destroying her.

She wanted to die and I wanted her to live and we were enemies who loved each other.
-- Yoli as narrator (chapter 3)

Importance: Yoli is attempting to reach Elf and create in her a will to live. Yoli understands that having a family surrounding her who loves her and wants her to live is destroying Elf. Elf wants her family to bless her on her journey into death.

She’s barely holding the pieces in place before it shatters.”
-- Yoli as narrator (chapter 4)

Importance: Yoli is talking about the glass piano that Elf believes is inside her. Elf is incredibly fragile and will shatter at any sudden movement. When she shatters she will die.

Everyone in the whole world was fighting with somebody to stay.”
-- Yoli as narrator (chapter 5)

Importance: Yoli is equating her struggle to stop Elf from killing herself with...