Sliding door

A sliding door is a door that opens horizontally, by sliding. Very often, such doors slide along a wall. Sliding doors are commonly used, for example in the bathroom, to separate the shower. They are also used for closets.

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  Tracks for a sliding door at a shop entrance, in Pompeii, 1st century AD

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  Some sliding doors are run on a rail, like this one

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  A modern wardrobe, with sliding doors

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  Automatic sliding door, in Hong Kong