Benjamin alerted me to this interesting article in the New York Times Home and Garden section. Below is a quote from the article written by Anne Raver of the New York Times.
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.

“Whooh!” he said, jumping to the ground and gingerly rubbing his back. “This isn’t as easy as it used to be. But see how the tree holds the memory of the weight?”