 These are made of three layers of Ethylene Tetrafluoroethylene (ETFE), a form of plastic that provides a lighter steel frame and allows for more sunlight to enter the building in order to generate solar power.Its pillows are also built to be easily detachable from its steel frame should more efficient material be discovered in the future.The main advantage of bionic architecture is that it allows for a more sustainable living environment through its reliance upon using renewable materials.