Photos: Extreme tree houses

Although ideal for the tropics, Hooch tree houses can be built as summer getaways even in climates with cold winters. The tiny foundation is a single pole, which allows for easy dismantling if the house needs to be moved. Made from Douglas fir remnants from lumber plantations, the pole is secured to the trees by cables. Fast-growing bamboo makes up most of the structure. Solar electricity and hot water in addition to a composting toilet are other green options.

Photo by Jo Scheer, Island Ambiance