Cocoon Tree is a 60kg hanging tree-fort. You can gang up multiple, special-purpose cocoons (bathroom, bedroom, dining room) to build a little treetop house, with a safety net beneath. Each cocoon is supported by six guy-wires rated to 1.6 tons each, and is framed in aluminum.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.