norwegian wood这首歌的意境是什么？

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歌词如下，歌词意思看得懂，但是不知john lennon写这首歌是想表达什么？即norwegian wood代表了什么？住在用norwegian wood造成的房子里的姑娘又代表了什么？有谁能说一下这首歌的背景吗？谢谢。
　　
　　Norwegian wood - The Beatles
　　
　　I once had a girl
　　Or should I say, she once had me...
　　She showed me her room
　　Isn't it good, Norwegian wood ?
　　
　　She asked me to stay
　　And she told me to sit anywhere
　　So I looked around
　　And I noticed there wasn't a chair
　　
　　I sat on a rug
　　Biding my time, drinking her wine
　　We talked until two
　　And then she said, "It's time for bed"
　　
　　She told me she worked in the morning
　　And started to laugh
　　I told her I didn't
　　And crawled off to sleep in the bath
　　
　　And when I awoke
　　I was alone, this bird had flown
　　So I lit a fire
　　Isn't it good, Norwegian wood