Christina Torres has a precise phrase for what the Spanish got wrong. “They said it was this horrible thing and brains bled out of ears,” the bioarchaeologist at the University of California, Riverside told researchers. “But that doesn’t seem to be the case.”
The Spanish arrived in the Andes and encountered the Collagua, an indigenous Peruvian group conquered by the Inca, many of whom had long, conical heads. The colonizers drew violent conclusions. What they were actually seeing was the result of cloth wrapped carefully around an infant’s skull — a slow, gradual reshaping of bone before the soft spots fused.
It was not unique to the Andes. Archaeologists have recovered skulls showing evidence of deliberate head shaping on every continent except Antarctica. The practice has a name: cranial vault modification. And after centuries of simply cataloguing it, researchers are now trying to explain it.
More Than Two Dozen Methods
Bone, when a child is young, remodels easily. Torres compares the mechanics to shaping a bonsai tree — controlled pressure applied over time produces a lasting form. Experts have identified more than two dozen distinct apparatuses used across cultures to produce different skull shapes. The most common method required the least equipment: wrapping cloth circumferentially around the head to create a longer, more conical form. Fabric and pillows were enough. No surgery, no specialist tools.
The parallel to modern medicine is closer than it sounds. Infants today diagnosed with plagiocephaly — a flat spot from sleeping in one position — are frequently prescribed helmet therapy to redirect skull growth. The principle is the same. Only the intention differs.
Because infants cannot bind their own heads, the practice was necessarily performed by caregivers. That detail matters. Whatever the motivation, it was a deliberate choice made by adults on behalf of children.
No Single Explanation Holds
According to the report, researchers studying the Peruvian Andes — where documentation of the practice is most extensive — are finding not one explanation but many, some of them contradictory.
In certain communities, a shaped skull appears to have marked group identity or social status. In others, head shapes vary even among close family members, which weakens any theory built on collective signaling. Perhaps most striking: in some cases, researchers suspect the visible head shape was not the intended outcome at all. The shaping may have carried meaning tied to the process itself, not the result.
Matthew Velasco, a bioarchaeologist at the University of North Carolina at Chapel Hill who studies head shaping in the Peruvian Andes, puts the scope plainly. “Something as ostensibly shocking as cranial modification may have been almost a routine practice for some children in some time periods,” he said. The practice likely originated deep in human prehistory and emerged independently across multiple cultures and eras.
“I think we have to start from the assumption that the meaning varies across time and space,” Velasco said.
The pre-Inca site of Paracas has yielded skulls dating to around 1000 B.C. that show the practice was established centuries before the Inca empire formed. Whatever drove communities to reshape the skulls of their children, it was not a single impulse — and it was not brief.
Photo by Boris Hamer on Pexels
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