"The private cabin in the nose of the A380 with a double sliding door has helped us with the exploration of the concept of privacy, " he says.

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When I travel with my wife and two young daughters, we do this and giggle the whole time, visiting through the sliding door from one room to another.

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Mr. Nel said it didn't make sense that a man who has been portrayed as fearful for his safety would leave his bedroom sliding door open or that Mr. Pistorius would fire through the bathroom door before checking where Ms. Steenkamp was located.

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In Alcoa's Pittsburgh office Chief Executive Klaus Kleinfeld has a cube with a sliding glass door.

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Sliding glass door can be kept open to encourage collaboration, or closed for conference calls or meetings.

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In the 1950s, sliding-door closets were introduced, according to California Closets, and the walk-in first emerged a decade or so later.

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He limped briskly to a sliding glass door in one of the bedrooms, where he struggled to undo the stubborn metal lock.

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All of the new line of computers boast a 250-watt power supply, a sliding front door allowing for easy access to four USB ports and dual optical disk bays.

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"Oh man, that's all my stuff coming out the door, them sliding-glass doors down there, " he said on the video.

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In desperation I stepped over to the closet, with its two sliding doors, then rolled one door open, plunged inside, pushed it shut.

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