Lyric discussion by mascardo 

I was thinking that maybe "wonderwall" could be thought as a wall. Not a wall as in a boundary, but giving a sense of security. So wonderwall could be translated into a guardian for security for life in which one loves.

Also, what does the line "Today is gonna be the day that they're gonna throw it back to you" mean? It doesn't seem to make sense in the context of "you're my friend and i secretly love you" deal.

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