Crop circles reported in the UK

As Americans bought more gluten-free products between 2008 and 2022, British farmers reported fewer mysterious circles in their wheat fields, which is either a devastating indictment of American dietary trends or evidence that crop circle artists are tracking the market. The negative r of -0.97 is almost too poetic: as the world turned against wheat, even the aliens apparently lost interest in it. One imagines extraterrestrials surveying the gluten-free aisle at Whole Foods and quietly canceling their UK fieldwork budget. The wheat, it seems, lost its mystique along with its consumer appeal.

UK crop circle reports peaked in the late 1990s and early 2000s and declined steadily through the 2010s as the phenomenon lost media novelty and the community of enthusiast hoaxers aged and dispersed. US gluten-free product sales grew from under $1 billion in 2008 to over $7 billion by 2022, driven by celiac disease awareness, the wellness industry, and a broader consumer trend toward 'free-from' foods. The negative correlation captures two independent trends moving in opposite directions across the same 15-year window — one fading cultural phenomenon and one ascending food marketing category — that happen to fit an inverse relationship.

A negative correlation is a mirror held up to two things walking away from each other, and the mirror tells you nothing about why either of them is moving. Sometimes the most interesting data point is what stopped.