While ecological materials already focus on the use of natural fibers as a reinforcing material and natural materials in composites, a number of researchers and manufacturers are now working on production processes that enable materials to be grown organically ( e.g. Ecovative Design.). Fungal species come into play here, for example those able to solidly bind organic waste materials. Crude oil is not required. The organic manufacturing process is based on the cellulose found in natural waste products such as the husks of rice and wheat, as well as on lignin as a binding matrix material. A new process utilizes the growth principles of the thread-shaped myzelium of fungi, which in nature usually colonizes on solid substrates such as wood, soil and organic waste, to produce hard foams naturally. The fungi form a network of microscopically small threads, which solidly binds the various organic waste materials. This effectively finds its way in packing material, and as a simple and cheap form of insulation.