The Atrium

An Atrium is a large open space, that is located within a building, it provides light and ventilation to the interior and it has a glaze roof. it is a central area in a building open to the sky.
  The glazed roof are skylights; skylights are light transmitting fenestration for daylight purpose.
An illustration of an atrium with skylight roof is this plaza located in Lagos Island ( former oluwole center) Lagos state Nigeria.  The use of skylight roof above the atrium has created illumination and ventilation for the users of the building. therefore reducing cost of energy and providing a good energy sustainability.

providing day light into the interior space