Do Not Disturb

Dan Barry: Thirty years ago this month, the Sony Corporation made a huge contribution to human interaction by ensuring there was less of it. No longer would people who did not want to engage the world have to stick fingers in both ears and say, over and over, "La, la, la, I'm not listening!"



Thanks to Sony, they now had a portable stereo device called the Walkman, which allowed them to block the sounds of their surroundings with a very private cassette recording of, say, Supertramp. So what if the headset and the 14-ounce unit strapped to your belt made you look like a drive-thru attendant at some Wendy's of the future?



Today, of course, the ocean of humankind is cluttered with…