"...Some of the world's best treehouse designers opened up to PM about how they do their jobs—and shared pictures of their favorite designs."

That is one of the most awesome things I have seen, I would love to have one of those!

I remember a little tree platform in an elm tree in my Ohio back yard. Some afternoons I would nap up there, and the tree would move in the wind. I could hear the wind in the leaves and the motion was unbelievably peaceful.