The Lilypad Project may be one of the most complex and forward-thinking green design projects ever conceived. Each individual ‘pad’ is structured to be a self-sustaining city that can travel the world’s oceans and rescue refugees due to disasters and rising sea levels. They would be powered by a combination of thermal, tidal, solar and wind energy and each would have a huge capacity – housing up to a half-million people a piece. The three-dimensionally complex design creates hills and valleys as well as recreational, commercial and residential spaces, giving them an organic complexity that makes them somehow believable as places where humans could live out entire lifetimes. (Source)