3D Scanning and Printing in Archaeology

Since last semester (Fall 2022), for a Museum Methods class, I myself, along with fellow graduate students Laura Broughton and Liz McCreary, have been working on a hallway exhibit, focusing on 3D printing in archaeology; essentially how 3D printing could be used for educational or preservation purposes, and the issues that can occur when using this technology. Although we began this as an attempt to study how 3D printing could be useful in archaeological contexts or for archaeological purposes, the project really turned into how 3D printing is not as simple as it sounds. The exhibit is not done yet but be sure to keep an eye out for it in McElhaney Hall, or on our Instagram page, for when it is finished!

Scanning a sherd!

Initially we set out to scan and print different artifacts such as lithics (flaked versus groundstone), ceramics (incised versus painted), and bone, from two different 3D printers. We wanted to compare prints from both printers and the prints of different materials and decorations, in order to determine which printers were better and which materials printed better and could be of more use to the field of archaeology. However, we realized we needed to incorporate a 3D scanner first, and thus to save time and money for filament, we decided to print from one 3D printer. As scanning was more time consuming and more difficult than anticipated, we had to cut back on what materials we selected to print as well.

So, what is 3D printing? It is defined as being a process that makes a physical object based on a three-dimensional digital model, usually through the use of a machine that places down thin layers of a material in rapid succession.  In archaeological contexts, 3D printing has been used at sites like Çatalhöyük to record phases of archaeological investigation in 3D, to make the excavation process virtually reversible through a virtual simulated environment. 3D scanning has been used to create models of Bronze Age tools and weapons from Ireland, in order to conduct experimental archaeological research as the models undergo use-wear processes and investigate the development of damage on replica objects versus the ancient ones. Some researchers have even suggested using 3D digitization of use for both diagnostic and collection management purposes. While the vast number of artifacts and accessibility to full collections, technical knowledge of how to scan objects, and the cost of the software and machines, have proven to be obstacles in the pursuit of giving more accessibility to those around the world to more collections through 3D printing, it is a valiant attempt at preserving the archaeological record in a new way and format. The Carnegie Museum of Natural History in Pittsburg, Pennsylvania has even used a handheld 3D scanner to digitize collection pieces that are printed and used in a museum exhibit. 3D scanners can be used to even restore damaged cultural objects or monuments, to get a better sense of what they looked like while intact. These are just a few of the ways that 3D printing and scanning are being incorporated into the world of archaeology and museums.

The Ultimaker S3 3D printer.

For this project here at IUP we used a NextEngine, Ultra HD, 3D scanner and or 3D printing we used an Ultimaker S3, both found in Indiana University of Pennsylvania’s STEAMSHOP, along with the appropriate corresponding filament which we were able to get from Amazon. IUP’s STEAMSHOP is an interdisciplinary digital fabrication lab that gives students, staff, and faculty alike the opportunity to engage in things like pressing vinyl on shirts and stickers, laser cutting logos, and of course, 3D printing objects. We extend a huge thanks to Maker in Residence, Johnathan Grengs, for assisting us during the undertaking of this project!

The lasers scanning the sherd on the acrylic stand.

We selected several prehistoric artifacts for scanning and printing; these included an incised ceramic sherd, a painted ceramic sherd, an arrowhead, and a quartz pendant. We set most of the artifacts on a clear acrylic stand parallel to the scanner and around ten inches away. The pendant did not require the stand. Each artifact was scanned about three times from different angles (top, bottom/back, front, and sides of the artifact), to pick up as much detail as possible. However, we started to encounter issues right from the start. First, the scans would take around half-an-hour each to complete. If the scan was incomplete or insufficient, we would have to take another, which took more time. We then needed to take of any excess data that made their way into the scan, before, taking all of the scans we had made to combine them and fuse them together.

Scans being fused together.

However, sometimes the system would crash when we tried to attempt this. When it comes to errors, when we fused the scans together, we had to align each scan by placing down three points on each, attempting to put them in the same spots to match the scans together, which essentially means we could have been accidently putting the dots in different spots, thus creating an inaccurate complete scan if the fused scans were incorrectly aligned. When we first started, we also did not realize we needed to save each individual scan, so much data was lost, and many scans had to be repeated. We eventually learned to save each scan separately before bringing them all back together to be fused and then saved as one complete scan. Essentially, it was a trial-and-error process that taught us there were going to be many fluctuations in the quality of the scans taken, causing us to have to take more scans than we initially planned for, which again took up more time.

Printing a sherd to scale.

As we moved on to transfer the scans to the 3D printer, another issue was encountered. The file sizes for the scans were so big that the system processing the scans to print them, was unable to do so. Eventually Mr. Grengs was able to fix this, and we moved on to the printing of the artifacts. Again, this took time, anywhere from at one hour and fifteen minutes or up to two-and-a-half hours. Once we were able to print some of the artifacts, we were able to discern many things about the abilities and accuracy of 3D scanners and printers. For example, one of the printed items had leftover data on top of the artifact scans that we missed as it was barely perceptible on the top. The printed object had some rough lines on top, most likely caused by the acrylic stand that was picked up by the scanner and not removed during the editing and fusing process.

The incised sherd printed at 200% its size!

We positioned all of the scans to be printed with the best side facing upwards, in the hopes that we would get the best representation of the artifacts. The bottoms of each artifact had to be printed on a base, which then had to be pried off once cooled. However, this basically made the bottom side unrecognizable compared to the original artifact. This showed us that the position in which we print the artifact is very important. We noted that the sides always printed very smooth-like, almost beautifully, with great detail, while the top looked almost like a topographic map, showing the last of the layers that were printed. This led me to realize that it might be worth it to try to print the objects standing vertically from one side, in the hopes that we would be able to get even more detail on the top, bottom/back, front, and the sides, as well, while only sacrificing a small portion of the side, rather than the whole bottom. We did this with a sherd blown up to 200%, and it came out beautifully!

We also learned that that the quality of the prints was also dependent on the artifacts themselves. Certain artifacts worked better than others, such as the incised lines decorations showing up on the prints rather than the painted designs. And for some reason, the pendant would not scan completely, despite not needing the acrylic scan to stay upright. We suspect this had something to do with the light fracturing through the quartz pendent, throwing off the scanner. At this point in time, we have not yet been able to print the arrowhead, as the scans will not even align properly, so hopefully we will be able to get over this hurdle and get a good print of the artifact.

For those that don’t have access to the software and technology to conduct 3D printings like we do, it has to be noted that it is an expensive endeavor. While also being time consuming and riddled with the potential for errors or to make a mistake, one has to be careful when deciding whether or not this is something they wish to pursue in whatever sphere they are doing so. For those planning on conducting work with 3D printers and scanners, we want this post to serve as a source for understanding that it is a lengthy process that does not always turn out how you expect. This method could be used to create replicas or scans for the public to use or examine, it could be used by museums in exhibits, it could allow greater accessibility to collections and even allow for a more in-depth analysis of artifact features, and so much more. However, I personally believe that one must use the highest quality of software and technology for the most accurate results, but what is currently available is just not affordable or the best quality. While our replicas were to scale and recognizable as to which artifacts they were of, higher quality of tech would certainly have made a big difference. For now, we hope our exhibit will show those starting out that 3D printing is a process, one that takes many mistakes and hours to figure out.

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Resources:

https://www.jstor.org/stable/pdf/10.5325/jeasmedarcherstu.2.1.0001.pdf?refreqid=excelsior%3A607eaebc6bad3a18247324a05deef839&ab_segments=&origin=&acceptTC=1

https://www.jstor.org/stable/pdf/24327507.pdf?refreqid=excelsior%3A4b56576788e90abf8501cb4b2f40b66a&ab_segments=&origin=

https://www.jstor.org/stable/pdf/26160210.pdf?refreqid=excelsior%3Ab3cde67aaa6637c68a77378d1544c100&ab_segments=&origin=

Anthropology Day 2023

Yesterday was world anthropology day so we thought this would be the perfect time to reflect on the relationship between archaeology and anthropology. It’s important to say that archaeology is anthropology through and through (at least in the U.S.) and archaeology developed with anthropological principles of wanting to understand and respect the cultures of the people that we study. But while other subsections of anthropology focus on languages, cultural ideas, and the physical make-up of humans, archaeologists tend to study the history of people and cultures through the stuff they left behind, or material culture.

 

As we know, archaeology tends to adopt methods, theories, and practices of other social sciences. One of the more recent methods that we have adopted is ethnography which is the study of people through thorough observation in order to understand their rich social lives and culture. In archeology, we use ethnography to try to understand past cultures and the patterns that we discover at archeological sites.  By studying a present-day culture that is analogous to a past culture, we can better understand the parts of cultures that we aren’t always able to find through material remains. 

The ways that archeologists use ethnographies vary depending on the site they are studying. Some look at historical ethnographies which are both published and unpublished sources such as archives and field notes. This information is especially helpful if the archeology involves a group that was observed and interacted with in the past but is no longer living, or, who had many cultural changes. Additionally, some archeologists rely on oral histories. These oral histories are like ethnographies but instead of asking questions related to cultural systems or participating in the culture through participant observation, the archeologist invites individuals to share their histories through their experiences or stories that were passed down through generations.  By consulting present-day people about the past and emphasizing group histories that have been passed down archeologists gain information on the lives of the people in the past. This information can then be applied to the material culture of the past groups related to the present-day cultures who gave oral histories. 

Archaeology is best when it consults all the sources it can, and ethnographic sources are some of the most informative depending on the site. We hope you enjoyed anthro day 2023 and we’re looking forward to seeing what the future of anthropology and archaeology holds!

 

Further Reading:

https://www.americananthro.org/anthroday

https://www.thoughtco.com/ethnoarchaeology-cultural-anthropology-archaeology-170805

Parker, Bradley J. 

2011 Bread Ovens, Social Networks and Gendered Space: An Ethnoarchaeological Study of Tandir Ovens in Southeastern Anatolia. American Antiquity 76.4: 603–27. 

Schiffer, Michael Brian. 

2013 Contributions of Ethnoarchaeology.The Archaeology of Science. Vol. 9. Manuals in Archaeological Method, Theory and Technique: Springer International Publishing, 53–63.

Politis, Gustavo

2015 Reflections on Contemporary Ethnoarchaeology. Pyrenae 46.

Archaeology of the Heart

Valentine’s Day is fast approaching! Have you bought the red roses and written notes to your valentine yet? Perhaps one of your Valentine’s Day cards will be in the familiar shape of a heart. But have you ever wondered where that shape came from, its origins, its symbolic and emotional meaning, and how it has transformed from the beating organ inside us all to the simple double-scalloped, v-shaped based symbol commonly drawn up on February 14th? And how did the simple shape become connected to the meaning of love? What archaeological discoveries contribute to our understanding of this symbol?

Ancient Cyrene coin with with heart-shaped silphium design.

To begin, let us ask, can archaeology really reveal human emotions, such as love, from the material culture and historical knowledge that is recovered from excavations? An article by a Sarah Tarlow (2000), titled “Emotion in Archaeology,” discusses just this. She reviews the archaeological approaches to emotion while “arguing that the study of emotion in the past is both necessary and possible.” She also notes that while “emotion history may not in itself be a useful focus for archaeological research, the study of emotion is a necessary part of any endeavor to look at social and cultural aspects of the past. If one cannot write a past which consists entirely of changing emotional states, neither should one write a past in which deeply meaningful aspects of human experience are either assumed or ignored” (Tarlow 2000:730).

Along with studying emotion, symbols are also something archaeologists should be aware of. You could turn to fictional symbologist Robert Langdon from The Da Vinci Code for iconographical inspiration, but John E. Robb’s (1998) article, “The Archaeology of Symbols,” discusses why and how archaeologists in particular, should be dealing with symbols. He concludes that “any serious consideration of ancient society requires us to deal with its symbols,” that “human symbolism is so diverse…that multiple approaches are needed to deal adequately with it,” and that “a major problem in the archaeology of symbols is understanding how varied kinds of symbols relate to each other,” thus “we need to incorporate symbols more fully into our understanding of social relations” (Robb 1998:329, 342).

Heart shapes were initially seen in ancient decorative art. For example, a gold and faience heart-shaped fig leaf pendant dating to 300-100 BCE was recovered from the Indus Valley civilization. Its shape could have contributed to the modern symbol we recognize today, as ivy, fig, and water-lily leaves were commonly found in art and heraldry. Ivy was also a symbol for fidelity. The Ancient Egyptians even believed the heart was the most important part of the body, the key to the afterlife, the source of intelligence, memory, emotion, personality, and even the soul. This belief is the reason that the heart was the only organ kept inside the body when it was mummified, unlike the others that were removed and preserved separately. Some turn to the city-state in Africa known as Cyrene, with heart-shaped silphium, a large fennel, that was imprinted on their coins. While silphium was used as a contraceptive, it might have become associated with the symbol of love as time passed. Some theorize that the heart-shape developed as a stylized depiction of human anatomy, meant to represent breasts, buttocks, or genitalia, while others believe ancient philosophers inspired the shape, as they saw the heart as a central part of a being.

Roman de la poire manuscript, 1201-1300.

While heart-shapes were common in art, it is believed that their connection to love began sometime in the 13th century. As courtly love in Medieval times began to lead to the production of more illustrations of such, the heart-shape began to be used more commonly as a symbol for love; the first depiction is in the 1250 French manuscript the Roman de la poire, with a man handing his heartesque-shaped heart to a lady. Typically, we see the heart being pointed upside up until the 14th century, but as the 15th century emerged, the typical two-bumps-at-the-top-one-point-at-the-bottom-shape, became used more frequently, so much so, it was placed on card decks.

16th/17th century heart-shaped urn from Rennes, France.

Playing cards from the Middle East entered Europe in the 1370s, and while their material was too fragile to survive in the archaeological record, surviving cards from the late 1400s are depict the heart symbol. Artifacts surviving in the archaeological record, including the five heart-shaped urns found in Rennes, France during archaeological excavations in 2015. They dated to the 16th and 17th centuries. Recovered in the basement of the Convent of the Jacobins, the urns contained embalmed hearts, one belonging to Toussaint Perrien, Knight of Brefeillac. Eventually, Catholic Saint Margaret Mary Alacoque’s 1673 depiction of Jesus’ Sacred Heart helped popularize the shape, along with the eventual celebration of St. Valentine’s Day established in A.D. 496, whieh was rejuvenated in the 17th century, with the accompanying love notes affixed with hearts. The Victorian era was rife with the greeting card tradition as well, leading to the heart decorations on mass produced cards today.

Thomas Dillon’s shop in Galway, Ireland with hangning claddagh ring symbol.

One of my personal favorite symbols of love with a heart-depiction is the one on an Irish Claddagh ring. Dating to around the early 1700s, when the design first appeared in an Irish fishing village named Claddagh, now part of the city of Galway, the ring was used as both an engagement and/or wedding ring, in order to save money. The design was created by a Richard Joyce, a craftsman who was taken by Algerians and sold to a Moorish goldsmith to work as an apprentice, only released after William III demanded so in 1689. Upon returning to Galway, he created his jewelry business, along with the Claddagh Ring motif, despite his captor offering half of his wealth and his only daughter in marriage if he just stayed in Algeria to work with him. The rings became popular as they were the only Irish-made rings worn by Queen Victoria and later by Queen Alexandra and King Edward VII. They were made and supplied by a Dillon of Galway, who received the Royal Patent to make them, and since 1750, are still making them today. The hands represent friendship, the heart, love, and the crown, loyalty. Depending on how you wear the ring, it can take on four different meanings. If it is on the right hand with the heart turned upside down and away from the hand, then this means the wearer is not in a relationship. If it is worn on the right hand turned right-side-up and towards the hand, then the wearer is in a relationship. If it is worn on the left hand, with the heart turned upside down and away from the hand, then this means the wearer is engaged. If it is worn on the left hand turned right-side-up and towards the hand, then the wearer is married!

From the verb on the I ♥ NY shirt, to emojis and video game lives, hearts have infiltrated many aspects of our lives. The symbol and its meaning will forever continue to affect the way we express and depict the emotion of love; it may even evolve, altered just as it already has been, changing and shifting just as our societies, languages, and cultures do.

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Resources:

https://www.artandobject.com/news/history-heart-shape

The Archaeology of Love Part I: The Heart of the Matter

https://www.providencevintagejewelry.com/blog/history-of-the-claddagh-and-how-to-wear-an-irish-claddagh-ring/

https://www.jstor.org/stable/pdf/10.1086/317404.pdf?refreqid=excelsior%3A7ab043d47a386c9d5c1808588da82e5c&ab_segments=&origin=&acceptTC=1

http://users.clas.ufl.edu/davidson/Material%20Culture%20course/

Groundhogs: Friend or Foe?

Yesterday was Groundhogs day! A day when Punxatawney Phil (or Buckeye Chuck, or Woodstock Willie, depending on what state you live in) climbs out of his borrow and decides if it will be an early spring or 6 more weeks of winter based on the presence of his shadow. 

This day originated from a Christian Holiday called “Candlemas” where Christians would bring their candles to the church to have them blessed and ensure their household was blessed for the rest of the winter. Over the years, this tradition became a day of weather prediction as they believed that if there was good weather and bright skies on Candlemas, winter would continue, but if it was cloudy spring would arrive soon. 

Punxatawney Phil held by his handler.

As this tradition spread to other countries in Europe, the Germans had a variation that included a hedgehog seeing its shadow. Then, as German settlers arrived in Pennsylvania and other nearby regions, it became a groundhog that was the prognosticator for a continued winter or an early spring. 

 

This year, a few members of the upper cohort went this year and saw Phil proclaim that we will have 6 more weeks of winter to the crowd’s exasperation. As I stood there cursing Phils’ prediction and dreading a longer snowy and bitter-cold Indiana winter, I began to think of other ways rodents tend to interfere with the environment and make archaeologists’ jobs harder. 

Both present-day, and past rodents share an affinity for burrowing and creating tunnel systems under the ground that has a habit of disturbing sites throughout the United States. Their burrows tend to have a different color and texture than the surrounding soil making them stand out. Not only can they trip up archaeologists who might assume these rodent burrows are archaeological features (guilty), but they make it increasingly difficult to understand the stratigraphy of the site. Additionally, their back dirt tends to include artifacts that are thrown out of context and into upper levels, sometimes meters away from their original location. If that’s not enough, their borrowing can also disrupt larger features and artifacts caches which travel down centimeter by centimeter as the ground around them is displaced by the rodent.

Rodent Hole disrupting the stratigraphy of a unit.

We can’t always blame rodents, because humans have a history of disturbing archaeological sites just as much as they do. Plow scars and cut-and-fill areas are just two examples of the ways that different occupations of people can interfere with the features of a site. Lucky for us, Harris Matrices can help us understand and analyze the stratigraphy of a site including areas that have been bisected by rodent burrows or plow scars. All you need is plain gridded paper (or Excell) and a lot of patience as you start to relate the different stratigraphic levels to each other by context and characteristics. After your finished, your matrix will hopefully look like the one depicted here and will let you understand how each deposit relates to others.

An example of a Harris Matrix and an the associated stratigraphy.

So, while rodents do seem to make our lives harder as archaeologists, especially by predicting more winter which could curtail our spring field projects. We have tools that make it easier to understand why some artifacts are out of context and where the rodent borrows disrupted natural stratigraphy. Given this, I think it’s fair to say that groundhogs are our frenemies.

 

Further Reading:

https://www.groundhog.org/legend-and-lore

https://thesubversivearchaeologist.net/category/burrowing-rodents/

https://germannaarch.wordpress.com/2021/07/12/rodent-burrows-into-our-heart-and-our-site/

https://www.thoughtco.com/harris-matrix-archaeological-tool-171240#:~:text=The%20Harris%20Matrix%20%28or%20Harris-Winchester%20matrix%29%20is%20a,cultural%20events%20which%20make%20up%20a%20site%27s%20history.

Spatiotemporal data as the foundation of an archaeological stratigraphy extraction and management system