The author of Treedom Takashi Kobayashi's treehouse was featured on MSN yesterday. The treehouse is located in Hokkaido and made from driftwood. It was also featured in a Nescafe commercial.

 http://realestate.msn.com/slideshow.aspx?cp-documentid=24168780&Gt1=35000#7#q=11%20amazing%20treehouses%20%3A%20Driftwood%20Egg%20treehouse