Tim Smit says we should "Demand the impossible", and in a disused china clay pit in Cornwall, the impossible has been delivered - a living theatre of plants and people and their interdependence, contained in the world's largest greenhouses. This is the story of the Eden Project, told by its creator, Tim Smit, from its genesis in the Lost Gardens of Heligan, its design and construction against the odds, the personalities of the team, the energy that brought the vision to life, and the future for the Eden Project...