Therefore work on the land is an introduction both to nature and to civilisation and gives a limitless field for scientific and historic studies. If the produce can be used commercially this brings in the fundamental mechanism of society, that of production and exchange, on which economic life is based. This means that there is an opportunity to learn both academically and through actual experience what are the elements of social life. We have called these children the "Erdkinder" because they are learning about civilisation through its origin in agriculture. They are the "land-children."