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 the underside of the room's overhead surface, while the roof is the top covering of a building.
You look up to see the ceiling when you are inside, but the roof is what covers the structure from the outside.
Ceilings are generally flat and meant to be looked at from below, whereas roofs can be slanted and bear the external elements.