You know how sometimes you read a novel and it was an OK but not great novel - but there was something in it that will stick in your mind forever?  Last year I read The Dive from Clausen's Pier and there was a character in it who was a great reader but only owned one bookcase.  He never allowed himself to buy more books than would fit in the one bookcase and once it was full, if he wanted to buy more books he had to start divesting.

I was simultaneously horrified and fascinated by that concept.  I've never been able to get it out of my mind.