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Oculus
An oculus (plural oculi, from Latin ''ラテン語:oculus'', 'eye') is a circular opening in the centre of a dome or in a wall. Originating in antiquity, it is a feature of Byzantine and Neoclassical architecture. It is also known as an ''œil de boeuf'' from the French, or simply a "bull's-eye".〔("Oculus window" ). Royal Institute of British Architects. Retrieved 24 January 2013.〕 ==Classical example== The oculus was used by the Romans, one of the finest examples being that in the dome of the Pantheon. Open to the weather, it allows rain to enter and fall to the floor, where it is carried away through drains. Though the opening looks small, it actually has a diameter of allowing it to light the building just as the sun lights the earth. The rain also keeps the building cool during the hot summer months.〔〔("Oculus of the Pantheon" ), About.com. Retrieved 24 January 2013.〕
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