Building these bridges takes decades of work. It begins with planting a sapling of Ficus elastica – a tree that grows abundantly in the subtropical terrain of Meghalaya – in a good crossing place along the riverbank. First the trees develop large buttressing roots and then, after about a decade, the maturing trees sprout secondary aerial roots from further up. These aerial roots have a degree of elasticity, and tend to join and grow together to form stable structures.

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