Can you walk a block of stone the size of a school bus? Can a rock that weighs tons and measures several meters long be walked? The most logical answer is (obviously) no, but things change if what we are talking about is the moai of Easter Island, the unmistakable carvings sculpted and distributed throughout the Polynesian island several centuries ago through the old town of Rapa Nui.
Beyond your meaningcharacteristics or design archaeologists have always wondered how the hell the natives managed to move those multi-ton masses from the quarries to the ahuthe ceremonial platforms on which they stood. The answer was just that: no more and no less than ‘walking’.
An ancient mystery. There are few sculptures in the world as iconic, unmistakable and fascinating as the moai of Easter Island, the enormous rock heads that seem to emerge from the earth on the distant oceanic island. Since Jacob Roggeveen and its people arrived there in 1722, the world wonders what they were for, what they represent and of course how their creators, the people of Rapa Nui, managed to move them from the quarries to their destinations.
Why is it so surprising? Because the statues, carved especially in volcanic tuff of the Rano RarakuThey measure several meters long and weigh tons. In fact, it is said that on average they are around 4.5 meters and 10 talthough there are older specimens. Taking that into account and that they had to move from the places where they were made to their platforms, how did the islanders move them?
It is not a minor question if we remember that on the island there are hundreds and hundreds of statues, some have the buried torso and were manufactured mainly among 13th and 16th centuries. Their displacement has aroused so much curiosity that over the last decades it has inspired various theories, such as the one that maintains that the figures they lay down on a kind of wooden sled with ropes. Now a group of researchers he thinks he has settled the debate once and for all. And your answer has little to do with trailers, horizontal loads and logs.
‘Walking’ sculptures. The ancient legends of Rapa Nui they assured that the moai arrived “walking” to their ceremonial platforms, the ahu. And although that possibility has always sounded like a pure fable, it seems that it was not so far off the mark. Thanks to a study that combines physics, 3D modeling and field experiments, a team led by experts from Binghamton and Arizona universities has confirmed that “the statues really walked”. And the most interesting thing is that this process had very little mysterious about it. It was simple physics and engineering.
All that was needed was ropes, people, paths and a special design.
“After studying nearly a thousand moai, Professor Carl Lipo and Terry Hunt discovered that the inhabitants of Rapa Nui probably used ropes and ‘walked’ the gigantic statues in a zigzag pattern along carefully designed paths,” he explains. a statement launched by Binghamton University.
Is it something new? More or less. The theory itself is not new. In the 80s a Czech engineer (Pavel Pavel) already raised that the moai moved upright thanks to a system that propelled them from two points. Carl Lipo himself and his colleagues they argued does years that the statues “walked” with vertical and oscillating movements, contravening the hypothesis that the people of Rapa Nui transported them upside down with the help of logs. To prove it they even did a practical demonstration that attracted interest of National Geographic.
Despite these efforts, there were still critical voices that questioned the theory. And that is what Lipo and Hunt have now wanted to settle by deploying their entire arsenal.
From the theory… To the facts, which is what the investigators have done. For prove the validity of his theory and better understand the movement of the carvings, Lipo and his colleagues turned to high-resolution 3D models and thoroughly studied the shape of the moais, both those that remain upright and the dozens that fell by the wayside when their creators tried to remove them from the quarry. Not only that. The team also incorporated practical tests into its argument.
Practical tests? Yes. The researchers built a moai of 4.35 tons and they dedicated themselves to moving it with the help of ropes. The result is fascinating and Binghamton University itself has taken care of divulge it on YouTube.
The team needed just 18 people to move the moai 100 meters in 40 minutes. “Once it gets moving it’s not difficult. People pull with just one arm. It saves energy and it moves very fast,” comment Professor Carl Lipo. “The tricky part is getting it to swing in the first place.”
That experience, added to the 3D models and the rest of the analysis, demonstrates, in the opinion of the archaeologists, that their theories “really work.” And to silence voices they have captured it in a paper published in Journal of Archaeological Science with a headline as revealing as it is provocative: “The hypothesis of the walking moai.”
Have they discovered anything else? Yes. The researchers identified certain “distinctive characteristics” in the design of the moai that, a priori, made it more feasible for them to advance with an oscillating and zigzag movement with the help of the ropes. What features? The archaeologists quote two specifically: “wide ‘D’ shaped bases and certain inclination forward” (between 5 and 15º).
To be more precise, the experts appreciated bases wide and roundedespecially in the moai that were left halfway, which suggests that the islanders used them to move them (the design served to lower the center of gravity). Then, once the figures reached their destination, they carved them to settle them.
Another of the clues they have found is in the paths used by the islanders of Rapa Nui. Its width (4.5 meters) and concave cross section invites experts to think that roads were “ideal” to stabilize the statues. “Every time they move one it seems like they are building a road,” reflects Lipo. “In fact we see that they overlap each other and that there are many versions in parallel. Probably what they did was clear a path, move it, clear another, clear it more and move it following a sequence.”
Claiming a people. For Lipo and his colleagues, their conclusions are interesting for several reasons. To begin with because they are convinced that it is the best theory to explain the movement of the moai. In fact, they challenge detractors and defenders of other hypotheses to prove them wrong. “Everything we have seen and thought so far reinforces the argument,” they insist. The second reason is that, in his opinion, the study vindicates the islanders.
“It shows that the people of Rapa Nui were incredibly intelligent.”
Images | Hal Cooks (Unsplash) and Binghamton University-Carl Lipo
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