The 5,500-square-meter Nanjing Green Lighthouse takes on a spiral form and is centered on a light-filled atrium that funnels natural light and fresh air to all floors. “We would all like to produce more ‘green’ buildings with lower energy consumption or low carbon emission,” says Archiland International. “The challenge is at the same time to make this necessary new buildings even more attractive than buildings of today and not just making engineering technology driven machines.