I really like the steel, concrete and glass structure of the Elm & Willow House by Architects EAT. This addition/expansion was enveloped around an existing tree creating a really cool courtyard. The steel beams on the exterior really construct and interesting frame work that evokes a raised stilt look. Put in a nice water feature and you may just feel like you are on vacation relaxing in this space. I need one of these on the back of my house.