from a review of “The Social Life of Paper”
On a busy day, a typical air-traffic controller might be in charge of as many as twenty-five airplanes at a time – some ascending, some descending, each at a different altitude and travelling at a different speed. He peers at a large, monochromatic radar console, tracking the movement of tiny tagged blips moving slowly across the screen. He talks to the sector where a plane is headed, and talks to the pilots passing through his sector, and talks to the other controllers about any new traffic on the horizon. And, as a controller juggles all those planes overhead, he scribbles notes on little pieces of paper, moving them around on his desk as he does. Air-traffic control depends on computers and radar. It also depends, heavily, on paper and ink.

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