But the developed world has lost sight of direct productive activity.

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Now the camera can be triggered from up to 20 meters (66 feet) away, and a direct line of sight is not necessary.

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Infra-red communication suffers the same problems, but has the additional limitation of requiring a direct line of sight between objects as anyone who has tried to operate a television remote control with someone else standing between him and the television will know.

ECONOMIST: The human body as a computer bus