This will be how all space stations are built: Not as one piece, but accumulated in bits and pieces. Smaller stations will be symbiotically combined into larger stations. View this mesmerizing animation by USA Today for a timelapse account of the ten year growth of the first International Space Station. I realized from watching this wonderful summary that space stations will be like cities: ever changing, ever accumulating, ever growing. Some may grow to be a century old, full of new layers but and contain ancient parts they cannot shed.