Tea trees grow on top of 16 glass-walled buildings in a complex in Hangzhou, East China's Zhejiang province. [Photo provided to chinadaily.com.cn]

Tea trees were spotted on top of 16 glass-walled buildings in OōEli, a complex designed by renowned architect Renzo Piano in Hangzhou, East China's Zhejiang province. The idea of planting tea trees came about eight years ago when the designer visited the Longjing Tea Garden in Hangzhou.