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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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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"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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