Trope-a-Day: Space Nomads

Space Nomads: Several kinds, ranging from perpetual wanderers (say, the remnants of the londian), through long-range explorers (say, the spinbrights), to people like the residents of Imperial city-ships, skymalls, empire ships and other large starships, some of which travel with a purpose, and some of which just stuck an engine on their habitat so they could enjoy a change of view from time to time.