A house in a tree. A place to go to get away from the world; to be above everything. I built many a treehouse as a kid. In fact, a large portion of my childhood allowance was spent on nails and lumber for tree houses. My mom used to take us to the lumberyard to get the scraps they were throwing away. At various points in time I built an elevator, a fireman's pole, running water, and lights into my treehouses(we had a lot of trees, so there were a lot of treehouses).
I miss my treehouses. I miss being able to climb up in a tree and forget about the world. It's one of the down sides to living in New York City.
Treehouses aren't just for kids. Grownups build treehouses too, but sometimes have problems getting building permits for them. I think everyone should live in a tree.