Treehouses

I was thinking about a great house I once been in and beside the fact that it was drawn by an architect and was big, it had two great features, a stream that ran through the house and a big tree its trunk go through all 3-4 storeys through a lightwell with many windows. This gave me the idea of exploring of another architecture using a tree : a treehouse. I found many website having great houses big and small build as a treehouse, my favorite sites are : http://www.saveourtreehouse.com/SaveOurTreehouse/links/our_favorite_tree... and http://www.thetreehouseguide.com/list2007.htm

I found on a broken site this image which struck me by its childlike architecture which was obviously well planned :