It takes so long that the people who planted the tree will never be able to see it become the bridge that will carry their descendants across the river. That tree will be transformed into a sustainable structure, on one of the many living bridges in Meghalaya in northeast India. Meghalaya, which means "Abode of Clouds", is possibly one of the wettest places in the world, where bridges must withstand powerful torrents of water during the monsoon. Interestingly, these bridges are built in a matriarchal society. In the Khasi language a tree is masculine, but when it becomes wood, it becomes feminine. In general in the Khasi language when something becomes useful, its gender is changed to feminine.
The video shows a BBC short film showing how living bridges are built.