Lyric discussion by optimisticemo 

Cover art for The Number lyrics by Pretty Girls Make Graves

this song is about how she finds and old lover who has changed. and its now left cold and heartless like a machine. but she still wants him, but doesn't know why or how she wants him. but then when he opens up his arms she runs in to the "sea" and knows where she belongs.

that's what i got out of it.