I'm going to put this in the best terms i can think of.
Basically, say you really like a certain house and you really, really want to buy it. You love what it looks like on the outside and have heard great things about the inside of it but have never actually been in it yourself, still you imagine this house to be the house of your dreams and no other house will do.
You become obsessed with the house and the idea of it being yours but in reality, it is never going to happen and you know this, so why do you still want it so much?
Has the house become your idea of an ideal house? is it REALLY that house you want or is it the bigger picture that you should be looking at? Is it A house that you want? something which makes you as happy as the house you think so much about but cant have?
And lastly, does the person with the obsession run the risk of building up such a perfect picture in their imagination that they begin eliminating the possibility of buying any other house as no other house could ever compare to that picture?
Interested in your thoughts.