Crop Circles: The Hoax That Fooled the World

For a few summers in the 1980s, the fields of southern England seemed to be sending a message. Perfect circles appeared overnight in wheat and barley, then rings, then elaborate patterns. Researchers measured them, scientists proposed weather phenomena, and some people were sure they were landing marks of craft from elsewhere.

Then, in 1991, two men in their sixties explained how they had been making them for thirteen years. The story of crop circles is one of the clearest examples of how a hoax can be mistaken for a mystery, and how it can survive being exposed.

Two friends and a pub

Doug Bower and Dave Chorley said they began making circles in 1978. They had been inspired by a 1966 case from Tully in Queensland, Australia, where a farmer reported a flattened circle in a swamp that became known as a saucer nest. If people would believe that, they reasoned, they might believe more.

Their equipment was simple: a plank of wood, a length of rope, and a baseball cap fitted with a wire loop that let them sight on a distant point and walk in a straight line. Working at night, they could flatten a large circle in a few hours.

The circles spread

Reports clustered in Hampshire and Wiltshire, near roads, villages and ancient monuments such as Stonehenge and Avebury, which added to the sense of mystery. Researchers who called themselves cerealogists studied the formations closely. In 1989 Colin Andrews and Pat Delgado published Circular Evidence, a book treating the circles as an unexplained phenomenon.

Several explanations competed: unusual whirlwinds, energy lines in the earth, and visitors from space. Very few investigators started from the simplest hypothesis, that people were making them, perhaps because the circles looked too neat to be the work of pranksters.

The confession

In 1991 Bower and Chorley went public and demonstrated their method to journalists. They claimed more than 200 circles made between 1978 and 1991, including all the circles reported before 1987. The demonstrations showed that two people with a plank could produce formations that experts had declared impossible to fake.

The confession did not end the circles, and it did not convince everyone. Some believers argued that the two men could have made only some of them, and that the rest were still genuine. It is a common pattern with exposed hoaxes, as the story of the Cottingley fairies also shows.

From prank to art form

After 1991 the formations grew bigger and more elaborate. By 2001 about 10,000 crop circles had been reported around the world, and some designs contained as many as 2,000 separate shapes, complex geometry that took teams and careful planning to lay out overnight.

Some of those teams work openly. The Circlemakers, a British arts collective founded in the early 1990s by Rod Dickinson and John Lundberg, makes formations as art and for commercial clients, including advertisers. The people producing the most impressive circles today are, in other words, quite happy to say so.

Farmers and the law

Crop circles damage crops, and farmers have not always been amused. In Hungary in 1992, two 17-year-old students who made a 36-metre circle were taken to court; their liability was limited to about 6,000 forints, around 30 dollars, of damage to the circle itself. In the United Kingdom in 2000, Matthew Williams became the first person arrested for criminal damage over a crop circle, and was fined 100 pounds plus 40 pounds in costs.

Some farmers have found another answer: charging visitors to walk through a famous formation.

What the circles taught investigators

The crop circle years are now a standard example in courses on critical thinking, because they show how investigators can be led by their own expectations. Researchers measured the formations, photographed them from the air and catalogued their features, but most of that effort went into describing the circles rather than testing the simplest explanation.

A single night spent watching a field, or a direct attempt to reproduce a formation by hand, would have answered the question years earlier. When Bower and Chorley finally demonstrated their method, what surprised people was how easy it was. The lesson applies far beyond wheat fields: before reaching for an extraordinary explanation, check whether an ordinary one has actually been ruled out.

There is a second lesson too. Once the confession was public, the most elaborate formations were made openly, by artists who were happy to take credit. The mystery did not disappear because it was disproved; it disappeared because the people making the circles stopped hiding.

Why the hoax worked

Crop circles fooled people for the same reasons many hoaxes do. The evidence appeared overnight with nobody watching, the patterns seemed too precise to be human, and the people investigating were looking for something extraordinary. Each of those is a warning sign worth knowing; our guide to evaluating a claim sets out how to test them.

The circles also remind us that the most likely explanation is usually the least exciting one. That rule served well with famous hoax photos, and it served well in the wheat fields of Wiltshire.