ABOUT a year ago, I flew to Singapore to join the writer Malcolm Gladwell, the fashion designer Marc Ecko and the graphic designer Stefan Sagmeister in addressing a group of advertising people on “Marketing to the Child of Tomorrow.” Soon after I arrived, the chief executive of the agency that had invited us took me aside. What he was most interested in, he began — I braced myself for mention of some next-generation stealth campaign — was stillness...

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