Reigning majestically amid the treetops, the treehouse is a bastion of freedom and security in harmony with nature. It is a construction based either on a single tree or several, or on stilts in the middle of trees. Different methods of treehouse construction differ substantially from other types of building, requiring a profound knowledge of the materials to be used. In terms of use and design this special architectural discipline is full of surprises. The projects assembled for this volume show the present extraordinary treehouse variety. While natural motifs like nests, cocoons or caves are frequently employed, references to UFOs as well as other futuristic styles influence design fantasy shall know no bounds."