The Honey Pop chair, by Tokujin Yoshioka, is an interesting concept. It's pleated paper, like those holiday decorations you get at Winn-Dixie, but couch-shaped. You spray it with water and sit on it, and move it around you until it conforms to the shape you want. It's a one-shot deal, more for the initial experience than anything, but it's an interesting method of creating it. Once again, thanks Yuichi for pointing it out.