in late 2022, a farm owner noticed a few sheep on her farm in inner mongolia walking in a circle. eventually, all 400+ sheep in her herd started walking in a continuous, perfect circle for 12 straight days.
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without a landmark humans cannot walk in a straight line.
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Humans are masters of navigation. Over the course of history, we’ve developed tools to help us explore not only Earth but other planets. Yet strip away all those tools, blindfold us, and tell us to walk in a straight line, and inevitably we become a directional mess, turning in tight loops. Many studies in the past have cataloged this phenomenon again and again. Without some form of reference, such as a mountain, a building, or even the sun, humans are incapable of walking in a straight line, no matter how hard we try. It happens whether we’re blindfolded or just lost in the forest. So what’s going on.
We don’t know for sure, but scientists have been able to rule out some popular go-to explanations. Researchers from the Max Planck Institute for Biological Cybernetics in Germany discovered that body asymmetries (different-sized legs, right-handedness vs. left-handedness, etc.) didn’t account for such vast misdirection. Additionally, the idea that people can’t correctly calculate the movement of their legs doesn’t explain the tight-looped pattern. The scientists theorize that with every blindfolded step, a very small directional discrepancy from a straight line is introduced, which then compounds with every additional step. Without the aid of visual references to unconsciously correct for these discrepancies, blindfolded people are poor at navigating a straight line, and will inevitably begin walking in tight-looped circles. While this theory explains why we do this, scientists aren’t sure of the biological how (though they think errors in the inner ear may be to blame). For now, this straight-line conundrum remains one of the many mysteries of the human brain and body.
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‘i keep a close watch on this heart of mine
i keep my eyes wide open all the time
i keep the ends out for the tie that binds
because you’re mine, i walk the line.’
-johnny cash, ‘i walk the line.’
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– Length (in miles) of the longest straight line possible at sea, connecting Pakistan and Russia
19,940
– Highway #10 is the world’s longest straight road (149 miles), in Saudi Arabia, per Guinness World Records
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source credits: newsweek magazine, interesting facts