Treehouses are something I've never personally experienced. Maybe we just don't get that kind of enourmous, back-garden type of tree in the South of Spain (I did have an apple tree as a child in England, however). Maybe we just don't realise what we're missing, what with all the swimming pools and beaches... Or maybe we'd be more interested if all tree houses looked like the Wilkinson Residence in Portland:
Not bad. Not bad at all. This is what happens when you ask architect Robert Harvey Oshatz to design your house.