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, 17:51, January 12, 2008
An '''oculus''' is a circular opening in a roof which allows for rain and sunlight to spill through the roof to illuminate the interior of a building. [[Vatican]] architecture, especially in [[Saint Peter's Basilica]], makes great use of this architectural device. It is a relic of Roman times, in a way, and was used in circular, vaulted temples like the [[Pantheon]] under the Republic.
[[category:Architecture]]