Lyric discussion by Karma policeman 

I think it's pretty basic and straightforward, at least compared to many of her songs. It seems like a conflict betweeen nature and civilization, obviously favoring nature. Isobel represents the purity and solitude of nature, uncorrupted by dark things like lust and despair. The tower of steel seems figurative as well–a symbol of isolation from which nature will fight back against the evils of society.

Also, the moth stanza was taken from a true (or at least allegedly true) occurrence that happened to Bjork. A moth landed on the collar of her shirt and did not leave for the entire day, even when she took the shirt off. This seems like another manifestation of the purity of nature.

I also think that this has one of the most utterly beautiful instrumentations out of all her work.

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