What would a world look like if women made the rules? In one still run largely by men, it’s an interesting question. According to her publishers, author Megha Mohan was inspired by her great-grandmother’s matrilineal community in South India to scour the world in search of “lessons from societies where women make the rules”. Such societies have always existed, with modern micro-examples including South Korea’s unique online feminist trolls, co-housing experiments in Paris and North London and the Rain Queens of South Africa. And what might different ways of collaborating, working, child rearing – above all, power and identity structures – look like in such a world? Mohan– the BBC’s first global gender and identity correspondent in 2018 – explores.