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An atrium is an open, indoor courtyard or hall within a building that allows natural light and air to flow through the interior spaces. It matters because it improves ventilation and lighting in buildings while creating a visually impressive central gathering space.
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The Tucson High School Galleria and reflexive library (pictured) feature a modern atrium tetrastylum with four support columns and open roof
In architecture, an atrium (pl.: atria or atriums ) is a large open-air or skylight-covered space surrounded by a building. 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, with a glazed roof or large windows, and often located immediately beyond a building's main entrance doors (in the lobby).