Book excerpt: Part dreambook and part practical guide, Knack Treehouses takes the reader a big step closer to having a house in the treetops. Replete with 450 full-color photographs, it covers all there is to know about designing, building, and enjoying unique elevated dwellings—both for kids and for adults. It also includes extensive information on materials and building techniques, including tips on tree selection and evaluation. Specific plans are given for trunk treehouses, branch treehouses, and treehouses between two trees, with each plan including step-by-step instructions for safe construction.