Architects and designers have recycled ancient practice of collecting rainwater to make buildings ecologically friendly

When the legendary Taiwanese rock band Mayday were due to perform in Beijing one evening in May 2023, some fans were worried that the rainy weather could affect the show. Mayday were taking to the stage in Beijing’s National Stadium, also known as the Bird’s Nest, built for the 2008 Olympics. Like the real-life twig piles that give the building its nickname, the stadium is built with an intricate and highly porous lattice, made of steel.

“Don’t worry too much,” reassured an article published by the official newsletter for China’s ministry of water resources. “The Bird’s Nest also has its ‘secret weapon’!”