A ship as large as a country, and everyone aboard was born there. Five sections, a railway through the middle, a lit ceiling that brightens at dawn. No one knows when the Horizo left, where it began or where it is going: something happened a hundred and sixty years ago and the past went with it. The bridge is sealed and no one knows why. A silent grey order keeps the doors and has its suspicions. A world to live in and a mystery to wander around. Serious, slow, open to new corners.