The vast majority of crop circles are made by people, using simple tools, under cover of darkness. The modern phenomenon traces back to two friends in southern England who spent over a decade flattening patterns in wheat fields before anyone paid attention. Since their 1991 confession, a global community of “circle makers” has turned the practice into something between land art and competitive prank, producing increasingly elaborate designs that can span over 150 meters across.
Two Friends Started It in 1976
Doug Bower and Dave Chorley kicked off the modern crop circle era in Wiltshire, England, in 1976. Bower had heard stories from Australia about circular “flying saucer nests” found in fields, and over a drink one evening, he suggested to Chorley: “Let’s go over there and make it look like a flying saucer has landed.” They flattened a circle in a wheat field using a wooden plank attached to a rope, then waited for someone to notice.
It took years. The pair kept making circles throughout the late 1970s and into the 1980s, gradually refining their technique. When the formations finally caught media attention, they fueled a wave of UFO speculation and attracted self-proclaimed researchers who insisted the patterns couldn’t be human-made. Bower and Chorley came forward in 1991, demonstrating their methods for journalists, but by then the idea had spread far beyond two men with a plank. Other teams had started making their own formations, and the phenomenon had taken on a life of its own.
How They’re Actually Made
The basic toolkit hasn’t changed much since Bower and Chorley’s day: a flat board (called a “stomper” or “stalk stomper”), rope to pull it with, a sighting pole to keep lines straight, and sometimes a garden roller for larger areas. Teams typically work at night during the short summer darkness, entering fields along existing tractor tracks to avoid leaving obvious paths.
The speed is surprising. Documented circle-making efforts show that experienced teams work fast. A BBC documentary in 1998 filmed a three-person crew constructing a complex “Roulette Wheel” pattern in five hours, including setup time. Their fastest rate clocked in at one circular component per 58 seconds. A separate formation called the Julia Set, a design that had baffled onlookers, was later revealed to have been made by a three-person crew in two hours and 45 minutes. Doug Bower himself claimed he could produce a simple 10-meter circle alone in 20 minutes. Larger, more intricate designs can take longer. There’s evidence that at least one very large pictogram in 2009 required three days of work spread across multiple nights.
Why Wiltshire Gets Most of Them
Crop circles appear worldwide, but they cluster overwhelmingly in southern England. In a 2002 dataset of 96 UK formations, 46 percent appeared in Wiltshire alone, with another 10 percent in neighboring Hampshire. Together, southern English counties accounted for more than 80 percent of all reported circles that year. Even more striking, 44 percent of all formations fell within just 15 kilometers of Avebury, the site of a massive Neolithic stone circle.
This concentration isn’t mysterious once you consider the human geography. Wiltshire has wide, flat fields of cereal crops ideal for large designs, plus a long tradition of circle-making teams operating in the area. The proximity to Avebury and Stonehenge adds cultural appeal for makers who want their work discovered and photographed. The formations attract tourism, and some farmers now accept donations from visitors, creating a small economy around the phenomenon.
The Designs Keep Getting More Complex
Early crop circles were just that: circles. But through the 1980s and 1990s, designs escalated into elaborate geometric patterns featuring fractals, spirals, and mathematical relationships. A Mandelbrot Set (a famous fractal shape from mathematics) appeared overnight in a cornfield south of Cambridge. Formations have incorporated elements that reference pi, the Fibonacci sequence, and complex tessellations. Some span more than 140 meters in diameter.
This increasing complexity is often cited as evidence against human creation, but it actually tracks with what you’d expect from a competitive art form. Circle makers share techniques, plan designs using computer software, and treat each season as a chance to outdo previous work. The community is secretive by nature, since making crop circles involves trespassing and damaging crops, but some makers have gone public over the years to demonstrate their methods or contribute to documentaries.
Formations continue to appear. In the summer of 2025, new circles were reported in Dorset, England, and near Andechs, Germany, with designs exceeding 140 meters across.
What About the Plant Changes?
One argument frequently raised against the human explanation involves physical changes in the flattened plants. Researchers have documented that growth nodes (the small knobby joints along a cereal stalk) sometimes appear elongated in crop circle plants compared to standing crops nearby. In one well-studied formation in Hoeven, Netherlands, nodes at the circle’s center measured 214 percent the length of control samples. A hypothesis proposed in the 1990s suggested this swelling resulted from some kind of electromagnetic energy heating the plants internally, causing the flexible cell walls to expand.
However, control studies tell a more straightforward story. When normal cereal plants are simply knocked flat, a natural process called gravitropism kicks in: the plant tries to grow upward again, and plant hormones in the nodes promote cell elongation to bend the stalk. This alone accounts for about a 20 percent increase in node length within five days and up to 40 percent within ten days. The larger elongation values found in some formations remain debated, but mechanically flattened circles studied under the same conditions showed an average node increase of just 11 percent, consistent with gravitropism rather than exotic energy sources.
One physicist proposed in 2011 that circle makers might use portable magnetrons (the same component that powers a microwave oven) to heat plant stems just enough to make them pliable and fall over without snapping. Modern magnetrons are small, lightweight, and can run on a 12-volt battery. Exposing plants to microwave radiation causes growth nodes to expand, mimicking the anomalies that some researchers attributed to unknown forces. Whether circle makers actually use this technology or simply rely on boards and rollers, the point is that the observed plant changes have plausible mechanical and thermal explanations.
Why the Mystery Persists
Even with confessions, documentaries, and demonstrated techniques, crop circles retain an air of mystery for many people. Part of this is by design. Circle makers rarely claim credit publicly because they’d face legal consequences for crop damage and trespassing. This built-in secrecy means most individual formations are never definitively attributed to a specific team, leaving room for speculation.
The sheer scale of some formations also strains intuition. It’s hard to believe that a few people with planks could produce a 150-meter geometric pattern in a single summer night. But timed demonstrations have shown it’s not only possible, it’s routine for experienced teams. The artistry is real, even if the explanation isn’t extraterrestrial. Circle making sits in an unusual space between vandalism, land art, and performance, with the anonymity of the creators being part of the aesthetic.
A small number of researchers continue to propose geophysical explanations involving plasma vortices or atmospheric phenomena, but no peer-reviewed mechanism has been established that would create the precise geometric patterns observed. The geographic clustering in areas with active human circle-making communities, the steady increase in design complexity mirroring advances in planning tools, and multiple confessions from makers all point in the same direction. Crop circles are human-made, and the people who make them are genuinely skilled at what they do.