Mud Shell, a sturdy domed shelter from bags of hay attached to a wooden lattice that was then sprayed with a mixture of clay and fiber using a drone. The resulting structure can be constructed rapidly, in this case just four days, from cheap, lightweight and readily available materials. It combines the ancient building techniques of wattle and daub with cutting edge drone application technology. Little sacking bags filled with hay were mounted on a formwork of wooden struts arranged in a dome shape. The drone-sprayed coating binds the structure together, making it durable, weatherproof and permanent.