Talk about being GREEN

This is called a free spirit sphere, a nice idea for a getaway I would say. Designed by Tom Chudleigh. The inside isn't spacious, but from what I can tell, what the sphere lacks in space it returns in awesomeness. I mean it even rocks when you move around in it. There's a video tour on this site. There are also a few other projects for tree house that are not as cool but still worth checking out.