The Kilwa fragments demonstrate that the Indian Ocean is in effect an enormous lake across which cultures have been communicating for millennia, where traders bring not only things but ideas, and the communities around whose shores are every bit as connected as those around the Mediterranean. One of the things this object history makes clear is that the very word ‘Mediterranean’ – ‘the sea at the centre of the earth’ – is misconceived. It is not at the centre of the Earth, and is just one among many marine cultures.