Open-topped

The Wards are open-topped, with skyscrapers rising from the superstructure. Towers are sealed against vacuum, as the breathable atmosphere envelope is only maintained to a height of about seven meters. The atmosphere is contained by the centrifugal force of rotation and a "membrane" of dense, colorless sulphur hexafluoride gas, held in place by carefully managed mass effect fields.

"Like many other large resorts, the town operated electric tramways, with open-topped cars. The journey down the steep incline to the harbour must have been exhilarating at times, testing the brakes on the vehicles to the limit."