A single two-arm gas-pipe descended from the center of the ceiling.Do you see that hole in the ceiling?The room was all mirrors – walls, floor, ceiling.
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Roof
/ruːf/
The top covering of a building that provides protection from weather.
Examples:
The houses with tiled roofs had had their tiles stripped off.Drying her eyes, Lenina walked across the roof to the lift.The roof leaks.
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Ways to tell them apart:
The ceiling is an interior feature, while the roof is on the exterior of a building.
When you're inside, you look up to see the ceiling; the roof is above that.
Roofs protect a building from weather, but ceilings are more about aesthetics and insulation.
Remember that roofs are external, dealing with rain and snow, ceilings are internal, often featuring lights and fans.
Think of the ceiling as the floor above your head, while the roof is a protective hat for the building.