Editing Oculus (architecture) (section)

===Classical===
The oculus was used in [[Ancient Roman architecture]], one of the finest examples being that in the dome of the [[Pantheon, Rome]]. Open to the weather, it allows rain and air 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 {{convert|8.7|m|ft|abbr=in}}, allowing it to light the building.