Lyric discussion by WadeCothran 

Cover art for Codes and Keys lyrics by Death Cab for Cutie

I think this song is about two people who have grown apart and they're now just "flying circles inside a jar". When he says, "The air we breathe is thinning with the words that we speak," I think he means that they are both choking in the relationship and are unable to breathe.

In the second verse, she locks herself up (possibly metaphorically) to protect her heart from the "pangs of jealousy". Maybe he is seeing someone else, or maybe she is just too hurt to go on.

The 3rd verse explains the frustration of it all. I see "when you scream" as her clearing her head. When that happens, she's able to see the love she used to have. "Like a child throwing stones at the sky when they fall back to Earth as minor chords of major works" is a metaphor for throwing their love away, but as gravity pulls the stone back to Earth, the love she threw away keeps coming back to her. And even though it's a tiny stone, it's still part of the big picture and may affect the outcome of the rest of her life (the major work).

I don't think she finds resolve in the end, but even though they are apart, they are one because they're still breathing air from the same "jar". They realize it's beautiful because even though they lead separate lives and sleep in different rooms, they are still alive. The connection isn't lost. It can work again.

I love you Albinka...