The small house attached to the greenhouse was constructed out of elm trees peeled of their bark.
http://www.nytimes.com/slideshow/2009/11/04/garden/20091105-tree-slideshow_index.html
ROALD GUNDERSEN, an architect who may revolutionize the building industry, shinnied up a slender white ash near his house here on a recent afternoon, hoisting himself higher and higher until the limber trunk began to bend slowly toward the forest floor….the read the rest of the article, click link above.
