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A yaodong () or "house cave" is a particular form of earth shelter dwelling common in the Loess Plateau in China's north. They are generally carved out of a hillside or excavated horizontally from a central "sunken courtyard". The earth that surrounds the indoor space serves as an effective insulator keeping the inside of the structure warm in cold seasons and cool in hot seasons. Consequently, very little heating is required in winter, and in summer, it is as cool as an air-conditioned room. The history of yaodongs goes back centuries, and they continue to be used. In 2006, an estimated 40 million people in northern China lived in yaodongs.〔Lloyd, J & Mitchinson, J: "The Book of General Ignorance". Faber & Faber, 2006.〕 In the last decade, yaodongs have been brought to the attention of scientists and researchers. These traditional dwellings have been regarded as an example of sustainable design. It has been suggested that the yaodongs are a reflection of a key traditional Chinese concept – the harmonious relationship between human beings and nature. == Types == There are two types of underground yaodong: * those dug in loess cliffs, on the side of the valley: a typical example is the city of Yan'an; * those dug around an excavation conducted at the surface, serving as interior courtyard, called yaodong-well or sunken courtyard (photo cons). Where the construction of underground yaodong is no longer allowed, there are also yaodong built wholly or partially outdoors, with an arched structure inspired by the underground dwellings. The new vaulted adobe homes of this type are now common among farmers in the area. More elaborate yaodongs may have a façade built with stones with fine patterns carved on the surface. Yaodongs can also be constructed with stones or bricks as stand-alone structures. The inside walls are usually plastered with lime to make them white. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「yaodong」の詳細全文を読む スポンサード リンク
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