When a Few People Look Up, Why Do the Rest of Us Follow?

How a shared action becomes visible

There is an old idiom, “three people make a tiger” (三人成虎). If enough people repeat a report of a tiger, others may believe there is one. Repeated testimony can make a false report sound credible when we rely on other people’s reactions to interpret what we cannot check ourselves.

Sets of three are familiar: heaven, earth and humanity, the legislative, judicial and executive branches, past, present and future, and Korea’s Three Kingdoms period. They give us ways to organize particular ideas. In a crowd, a few people doing the same thing can also make a pattern easier to notice.

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How many people does it take to get a second look?

In the EBS documentary The Two Faces of Human Nature, people stood in a public street and looked up. The crew changed how many people were in on it and watched how passersby responded.

When one person looked up in the demonstration, most passersby went on their way. A lone person might have any number of reasons for looking up.

With two people looking up, some passersby glanced in the same direction. Most kept walking.

When three people looked up together, the program showed other pedestrians beginning to stop and look. What those new arrivals did became a signal for the people behind them.

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When a gesture becomes a cue

Once several people are doing the same thing, you may be more likely to wonder whether there is something they all noticed that you have missed.

Social proof is one way to describe the inference. If I have no reason of my own to look up, what somebody else is doing can supply one. Classic research by Stanley Milgram, Leonard Bickman and Lawrence Berkowitz found that larger groups on a sidewalk generally drew more looks. There was no universal threshold at three.

The crowd can also make a small act feel less conspicuous. If others have already stopped, it is easier to stop beside them and see what drew their attention.

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What happened at Sindang Station

On October 13, 2003, a man became trapped between a train and the platform at Sindang Station on Seoul’s Line 2. A photograph from the scene shows people trying to move the train to reach him. Newsis reported that emergency responders took him to hospital, where he died.

People on the platform joined one another in the rescue attempt. The photograph records the collective effort. It does not establish exactly how many people began it.

The image shows how readily a visible action can give others something to join. The stakes were very different from looking up in the street, and the outcome was tragic despite the effort to help.

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What the proverb gets right

The tiger proverb survives because we use other people’s reactions as evidence. That can help us notice something important. It can also lend a rumor weight it has not earned.

A few people doing something openly can make an available response easier to imagine. How many it takes depends on the people, the place and the action.

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The signal you give the next person

A group can make it easier to see what somebody has already begun and how you might join in.

There is a small question worth keeping from the old proverb: what do these people know, and what are they taking from one another? Looking up in the street gives you a harmless place to notice the difference.