Lyric discussion by Chloe le Fay 

It's based on the book "Charlotte Sometimes" by Penelope Farmer, the songs makes a lot more sense if you've read it. In the book, a girl goes to a boarding school, and every other day, when she wakes up, she's many years before, in the body of a different girl, who switches places with her, which is why she's crying for a girl who died so many years before.

@Chloe le Fay It's one of quite a few Cure songs that are based on literature: others include: "How Beautiful You Are" (based on Baudlaire'a poem "The Eyes of the Poor") and "Killing an Arab" (probably best known: from _L'Etranger__ by Albert Camus). A lot of people who apparently aren't familiar with Camus have found the latter offensive, to the point that it's gotten very difficult to get the original version, and it has been Bowdlerised into "Killing Another."

@Chloe le Fay You right, precious is based on the first chapters and the end chapters of the children's novel en.wikipedia.org/wiki/CharlotteSometimes(novel)

The "Glass sealed" is at the end "When Charlotte, back in her own time, places the marbles from the solitaire set sent to her by the adult Emily in a jar of water, she notes how big they look in the water, yet ordinary when taken out."

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