Stefan Lehnert

German engineer Stefan Lehnert has pioneered the use of ethylene tetrafluoroethylene - a highly durable, light and adaptable plastic - in architecture. The roof and cladding system he invented, based on plastic cushions filled with air, is energy efficient and able to withstand high impact. It has been used all over the world in high-profile architectural projects, such as the Eden Project in England or the Beijing National Aquatics Centre in China.