Pine Cone?

Green Buildings are discussed in the Economist this week.

It is officially known as the Swiss Re Tower, or 30 St Mary Axe. But Londoners universally refer to the newest addition to their skyline as “the Gherkin”, thanks to the 41-storey building's distinctive, curved profile, which actually looks more like a pine cone. What is most remarkable about the building is not its name or its shape, however, but its energy-efficiency. Thanks to its artful design and some fancy technology, it is expected to consume up to 50% less energy than a comparable conventional office building.

Here's a picture



"Pine cone" isn't the first thing that comes to mind.