Subliminal Advertising — The Popcorn Nobody Counted

In eighteen eighty-four, in Baltimore, two men sat at a table with a rebuilt post-office scale and a pack of shuffled playing cards, pressing weights too small to feel onto each other's fingertips. One of them marked almost every answer as a pure guess — and was right two times in three anyway.

Seventy-three years later, in a screening room in New York, a market researcher named James Vicary handed out a press release. Somewhere in New Jersey, it said, the words for popcorn and a soft drink had been flashed across a cinema screen too fast to see, and popcorn sales had gone up by more than half. A country took fright. The networks banned it; Parliament discussed it; three hundred people in Washington sat in the sleet watching a western, waiting to notice a word — and not one hand went up.

This is the story of the most famous experiment that nobody ever saw: the balcony rail in Fort Lee where the machine ran for six weeks, the theater manager who never saw a single message, the figures that were never published, and the man who said, five years later, that the data had been too small to be meaningful. It runs forward through ice cubes in a magazine gin ad, a little black box in the department stores, self-help tapes with swapped labels, and a salty Dutch sweet in a laboratory cubicle — where the hidden message finally showed itself, very small, and only to the thirsty.

And then it turns to the persuasion that never needed hiding: a survey of doctors on a newspaper page in nineteen twenty-two, a breakfast Charles Dickens ate on a canal boat, a penny for a half pint of milk in Chicago, a leaflet that said some milk for everyone, and fifteen cents off every hundred pounds — all of it in plain sight, and all of it working so well that it came to feel like something that had simply grown.

A calm, unhurried telling of the record, for sleep, rest, or a long drive in the dark. Nothing here will startle you or wake you.