The Oculus in Massive Concrete Dome lights the Rotunda Below
The massive concrete dome sits on the equally massive rotunda wall. The 30-foot (9.1 m) oculus at the dome apex is the only source of natural light and forms a kind of natural sundial as a shaft of sunlight tracks across the building throughout the day.
Image by star5112
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Posted to Pantheon, Rome, 126 A.D.
Licensed as CC BY-SA 2.0
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Image by star5112 via Monolithic Dome Institute (CC BY-SA 2.0)