It looks like something from a film, but this incredible creation may be the answer to the problem of water pollution. Dubbed the 'floating garden' the extraordinary whale-shaped craft is designed to carry passengers on waterways like the Thames and purify the murky water as it goes. The impressive 'green' machine, called the Physalia, also generates enough energy to power itself and sustain the vast array of plantlife on board. Award-winning architect Vincent Callebaut, who created the gardens, said: "Physalia is a half aquatic and half earthly amphibious vessel, a floating meeting place". [CFP]