Stephanie Chaltiel used drones to coat a shelter in clay, demonstrating a fast construction method that could be used in refugee camps and disaster zones. As part of designjunction during the 2018 London Design Festival the French architect and her team constructed 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 fibre 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.