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In architecture, an atrium (plural: atria or atriums) is a large open space located within a building.〔(【引用サイトリンク】url=http://www.thefreedictionary.com/atrium )〕 Atria were a common feature in Ancient Roman dwellings, providing light and ventilation to the interior. Modern atria, as developed in the late 19th and 20th centuries, are often several stories high and having a glazed roof and/or large windows, and often located immediately beyond the main entrance doors (in the lobby). Atria are a popular design feature because they give their buildings a "feeling of space and light". The atrium has become a key feature of many buildings in recent years. Atria are popular with building users, building designers and building developers. Users like atria because they create a dynamic and stimulating interior that provides shelter from the external environment while maintaining a visual link with that environment. Designers enjoy the opportunity to create new types of spaces in buildings, and developers see atria as prestigious amenities that can increase commercial value and appeal.〔Sharples, S. and Shea, A.D. (Roof obstructions and daylight levels in atria: a model study under real skies ) Lighting Research and Technology, Volume 31, Issue 4, Pages 181-185; SAGE Publications, December 1999〕 Fire control is an important aspect of contemporary atrium design due to criticism that poorly designed atria could allow fire to spread to a building's upper stories more quickly. ==Ancient atrium== The Latin word ''atrium'' referred to the open central court, from which the enclosed rooms led off, in the type of large ancient Roman house known as a domus. The impluvium was the shallow pool sunken into the floor to catch the rainwater. Some surviving examples are beautifully decorated. The opening in the ceiling above the pool called for some means of support for the roof, and it is here where one differentiates between five different styles of atrium. As the centrepiece of the house, the atrium was the most lavishly furnished room. Also, it contained the little chapel to the ancestral spirits (lararium), the household safe (arca) and sometimes a bust of the master of the house. The term was also used for a variety of spaces in public and religious buildings, mostly forms of arcaded courtyards, larger versions of the domestic spaces. Byzantine churches were often entered through such a space (as are many mosques, though the term is not usually used for Islamic architecture). 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「Atrium (architecture)」の詳細全文を読む スポンサード リンク
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