Big Ideas: Imogen Heap's Floating Houses

[youtube]http://www.youtube.com/watch?v=rT-DTvzvXc4If there weren't any pesky practical limitations, what world-changing device would you invent? To launch Babelgum and GOOD's new Big Ideas competition, renowned electronic songstress Imogen Heap gets the ball rolling with her suggestion that we all live in floating spherical homes, and allow areas damaged by man to regenerate.