Skeptophilia (skep-to-fil-i-a) (n.) - the love of logical thought, skepticism, and thinking critically. Being an exploration of the applications of skeptical thinking to the world at large, with periodic excursions into linguistics, music, politics, cryptozoology, and why people keep seeing the face of Jesus on grilled cheese sandwiches.
Showing posts with label Indus Valley Civilization. Show all posts
Showing posts with label Indus Valley Civilization. Show all posts

Wednesday, November 3, 2021

Feats of clay

As I write this, I'm waiting for a kiln full of pottery to cool enough that I can open it.

Opening a kiln, especially after the final (glaze) firing, is a bit like Forrest Gump's box of chocolates; you never know what you're gonna get.  Even though I have about ten years of experience making pottery, it's still a crapshoot every single time, mostly because so many things can go wrong along the way.  My first pottery teacher said never to get attached to a pot until it's cool, in your hands, after the final firing, and there's a lot of truth in that.  Besides the built-in uncertainty of a complex, multi-step process that never quite works the same way twice, there's the added complication that I love to mess around with new techniques, especially new glaze combinations.

So I must admit that just about all of my failures have been my own damn fault.

Sometimes, though, things work out a great deal better than you expect.

I got into pottery on a whim.  I've never been much good at artistic pursuits -- my former students will attest to the fact that my ability to draw kind of topped out in third grade -- but my wife is a brilliant artist, and had been taking lessons in pottery for a while.  She convinced me to give it a try, and after one lesson I was hooked.  I'm still at it ten years later, even though mostly I still just think of it as playing in the mud for adults.

Then there are the (many) times it doesn't go so well.  We have turned our failures into a game called "Confusing Future Archaeologists."

I've done a lot of wheel-throwing and hand-building, and we now have a studio that is completely taken over by pottery equipment.  I must say, in all seriousness, that pottery kind of saved my sanity during the pandemic lockdown.  Having something creative to focus on was a godsend.

Working on the wheel

I have no desire to learn to be a professional potter; an amateur I am, and an amateur I shall remain.  If every once in a while I produce something I judge as worthy of keeping, that's cool, but mostly I'm just in it to have fun.

Then, there's the potential for combining pottery with my other obsessions.  Yes, I know I'm a total fanboy.  No, I don't care.

The reason this comes up is a paper I ran into a couple of days ago in The Journal of Anthropological Archaeology about the techniques for pottery-making used by the mysterious Indus Valley Civilization of northwestern India four thousand years ago.  A team led by Alessandro Ceccarelli of the University of Cambridge did a detailed analysis of fragments of pottery from the Indus Civilization, and found that they were already using a great many of the techniques potters still use today -- pinching, slab-building, coiling, and wheel-throwing.  You might wonder how the researchers could discern the latter; a well-made coiled pot and a wheel-thrown pot can look a great deal alike.  But microscopic analysis of the shards showed that even after smoothing and firing, hand-built pottery still shows traces of the scraping potters do to join the pieces together and avoid cracking, while wheel-thrown pottery retains evidence of rotational stress in the clay particles that comes from the torque on the clay from the spinning wheel and the drag exerted by the potter's hands.

When I read that last bit, I thought, "Oh, of course."  One of the things wheel-throwers learn very early on is that throwing creates a twist in the clay, even if the homogeneity of the material makes it hard to see.  Multi-part pieces like teapots are where this is the most critical; when you put the spout on a teapot, you have to account for the fact that during firing the clay will "relax" or untwist a little, so what was joined to the body of the teapot as a perfectly-aligned spout can come out of the kiln tilted to the side.  Once you figure out how much the clay you're using untwists, you compensate by putting the spout on tilted a little in the other direction -- so during the firing, the spout will right itself and come out properly aligned.

It's kind of amazing to me how far back these techniques go.  Think about the insight our distant ancestors must have had to take this common substance -- clay -- and fashion it into something not only useful, but beautiful.  Now, I sit down at an electric wheel with homogeneous store-bought clay and perfectly-formulated stains and glazes, and fire my work in an electric kiln.  (And I still have pieces that flop sometimes.)  Consider the trial-and-error that must have gone into digging and refining natural clay, developing techniques for shaping (including figuring out how to build a kick-wheel), figuring out which available minerals would work as colorants and glazes, and using pit firing to harden the clay to make the piece usable for containing food or drink.  Modern potters are the inheritors of what clay artisans have learned over millennia of attempts, innovations, successes and failures.

"This study doesn’t just look at how pottery was made – it gives us a fascinating insight into some of the earliest ‘social networks’ and how people passed on knowledge and skills over centuries without the use of books or the technology we now take for granted," Ceccarelli said, in an interview with Heritage Daily.  "The objects we examined suggested that while communities of ceramic makers lived in the same regions – and often in the same settlements – different traditions emerged and were sustained over centuries.  There was a clear effort to keep alive their unique ways of making pottery to set them apart from other communities, like a statement of their identity."

All of which makes me wonder what those future archaeologists will think about my pile of smashed pottery.

But now, I need to wrap this up, and go check the kiln.  I swear, waiting for it to cool is like a kid waiting for Christmas.  And hoping that the brightly-colored boxes under the tree contain something better than socks, underwear, or an ugly sweater.

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My master's degree is in historical linguistics, with a focus on Scandinavia and Great Britain (and the interactions between them) -- so it was with great interest that I read Cat Jarman's book River Kings: A New History of Vikings from Scandinavia to the Silk Road.

Jarman, who is an archaeologist working for the University of Bristol and the Scandinavian Museum of Cultural History of the University of Oslo, is one of the world's experts on the Viking Age.  She does a great job of de-mythologizing these wide-traveling raiders, explorers, and merchants, taking them out of the caricature depictions of guys with blond braids and horned helmets into the reality of a complex, dynamic culture that impacted lands and people from Labrador to China.

River Kings is a brilliantly-written analysis of an often-misunderstood group -- beginning with the fact that "Viking" isn't an ethnic designation, but an occupation -- and tracing artifacts they left behind traveling between their homeland in Sweden, Norway, and Denmark to Iceland, the Hebrides, Normandy, the Silk Road, and Russia.  (In fact, the Rus -- the people who founded, and gave their name to, Russia -- were Scandinavian explorers who settled in what is now the Ukraine and western Russia, intermarrying with the Slavic population there and eventually forming a unique melded culture.)

If you are interested in the Vikings or in European history in general, you should put Jarman's book in your to-read list.  It goes a long way toward replacing the legendary status of these fierce, sea-going people with a historically-accurate reality that is just as fascinating.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]


Thursday, September 12, 2019

A new view of the Indus Valley

It's always fun when I stumble across some research that ties together three of my fascinations -- linguistics, genetics, and unsolved mysteries.

The research in question was published this week in Science, and gives us a new lens into the mysterious Indus Valley (or Harappan) Civilization.  This civilization, which started some time around 3,300 B.C.E. and lasted for a good two thousand years, flourished in what is now the western part of India and eastern part of Pakistan, producing massive cities, temples, a distinctive form of pottery, work in tin, bronze, lead, and copper, and a mysterious script that no one has been able to decipher (in fact, some linguists don't even believe it's a written language -- possibly just a set of non-linguistic symbols).

A Harappan seal with an example of the Indus Valley script [Image licensed under the Creative Commons PHGCOM IndusValleySeals.JPG, Indus seal impression, CC BY-SA 3.0]

Considering the extent of the artifacts and archaeological sites the civilization left behind, it's amazing how little we know for sure about them.  Their affiliations to other groups who were around at the same time (especially in the Middle East), what language they spoke, what religion they practiced -- all are inferences based on relatively scanty evidence.

This latest research adds a significant piece to what we know for sure about the mysterious Harappans.  The researchers who conducted it, a team made up of scientists from Washington University, Harvard Medical School, and the University of Vienna, looked at DNA extracted from 523 skeletons in the region dating all the way back to twelve thousand years ago.  The scientists were trying to shed light on two questions.  First, where did the Indus Valley Civilization's agricultural knowhow come from -- was it a local invention/innovation, or was it brought into a previous hunter-gatherer society by an influx of migrants?  And second, what is the origin of the languages spoken in the region then and now?

The answer to the first question seems to be that Harappans' agriculture was an innovation of their own.  The researchers found traces of DNA from contemporaneous farming cultures no nearer than Iran, and no evidence that they got any further than that.  So it seems like the Indus Valley transition from hunters to farmers was something they figured out for themselves.

What the research uncovered vis-à-vis the second question was that there was a DNA signature from European hunter-gatherers, but not as big as expected.  The usual linguistic model is that when there's a major language shift, it's usually caused by a large influx of migrants (consider the shifts from Native languages to English in Australia and the Americas).  Here, there was not nearly the amount of European and Middle Eastern DNA to explain the shift to an Indo-European language; the Eurasians who showed up there, the Yamnaya people, were apparently present in fairly small numbers.  What's fascinating, though, is that Yamnaya DNA is disproportionally present in modern-day Indians of the highest social classes -- since social class has traditionally been hereditary in Indian culture, the surmise is that the Indo-European speaking Yamnaya were in charge, and their language ended up superseding (or at least strongly influencing) the language(s) spoken at the time.

It's kind of analogous to the influence Norman French had on Old English in the years after the Norman Invasion in 1066 C. E.  Most of our terms that have to do with governance come from Latin via French, while a lot of the basic vocabulary (pronouns, prepositions, and so on) are from the original Germanic language.  Even more interesting is that the Norman Invasion left pairs of parallel words associated with food -- the one used for the animal as it's found on the farm is from the Old English peasants who raised them, and the one for the meat as it's seen on the table from Norman French aristocracy who only came in contact with the animal after it was cooked.  (Thus cow/beef, sheep/mutton, pig/pork, chicken/poultry, and so on.)  As the Indo-European influx into India happened five centuries earlier, you have to wonder if those kinds of word pairs existed for while there, too, eventually being swamped by the higher-prestige Indo-European verbiage.

So this research gives us one more piece of the puzzle regarding a group of people about whom we've known relatively little, despite their being ancestral to the vast majority of the population on the Indian Subcontinent.  And, of course, this is nowhere near the last word on the subject.  We'll continue to uncover more, and refine our understanding of the Harappans -- a civilization that has been gone for almost three thousand years.

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This week's Skeptophilia book recommendation is pure fun: science historian James Burke's Circles: Fifty Round Trips Through History, Technology, Science, and Culture.  Burke made a name for himself with his brilliant show Connections, where he showed how one thing leads to another in discoveries, and sometimes two seemingly unconnected events can have a causal link (my favorite one is his episode about how the invention of the loom led to the invention of the computer).

In Circles, he takes us through fifty examples of connections that run in a loop -- jumping from one person or event to the next in his signature whimsical fashion, and somehow ending up in the end right back where he started.  His writing (and his films) always have an air of magic to me.  They're like watching a master conjuror create an illusion, and seeing what he's done with only the vaguest sense of how he pulled it off.

So if you're an aficionado of curiosities of the history of science, get Circles.  You won't be disappointed.

[Note: if you purchase this book using the image/link below, part of the proceeds goes to support Skeptophilia!]