Why "Our Treehouse"?

It is simple enough really.  We live in an area that is surrounded by trees.  In fact, when sitting on the couch in our living room all I can see are tree tops and birds flying from their branch to the feeder outside the window.  But it gets better.  Not only is our home surrounded by trees, but we have a tree growing through our house too.  Thus, we live in a treehouse.  How fun is that?!