The central idea is a gravity cable: an invisible force link between a motor and a celestial target. Several independently controlled cables could combine to provide lift, propulsion, braking, steering and stability without wheels, rails, wings, propellers or reaction mass.
The book applies one simple design rule: preserve the useful function, remove only the constraints that gravity control genuinely removes, and keep the real limits of inertia, momentum, air resistance, weather, structure, safety and failure.
It examines personal mobility, passenger pods, virtual trains, freight networks, emergency services, gravity-supported construction, movable buildings, floating districts, sport, culture, planetary transport and interplanetary travel.
The entire system remains conditional on one decisive experiment: whether a useful directed gravity force can be produced, measured, locked, controlled and made safe through redundancy.