Guest Post: Sculpting Science?

Fossil preparation using a sandblaster.

[A recent post on feathered dinosaurs has led to an interesting discussion on whether and how we might extend Ian Hacking's ideas about the historical ontology of human kinds  to think more carefully about the material construction of natural kinds. I asked Caitlin Wylie, who is working on a PhD about fossil preparation at Cambridge HPS, if she had any thoughts on the matter.  In addition to the photo above, she was kind enough to send the following along:]

I’m glad to find that we all share a conception of scientific objects as theory-laden, even for objects as different as “bones, blood, and brains”! But I wonder if ontology is the most interesting focus to have here. Does it really matter if a fossil preparator actuallyremoves – or creates, for that matter – what today’s paleontologists interpret as feather traces? That interpretation and the resulting knowledge claims (i.e., that dinosaurs had feathers) are more important, if you ask me.

As Lukas wrote, “There is a strong intuition that some such material interventions change the object's ontology whereas others leave it intact.” Based on my ethnographies of paleontology labs, some changes are considered okay to make to fossils while other changes are not, but these okay and not-okay designations are not universal. Some preparators use super glue to repair fossils, for example, while others are militantly opposed (usually because they only want to make “reversible” changes to specimens, and they deem super glue impossible to fully remove). Fossil preparation, like making blood samples though maybe not like diagnosing a psychiatric patient, is inherently irreversible. You can’t put rock back on once it’s been chiseled off.  So this process of making a specimen visible involves quite a lot of decisions with permanent implications, from choosing tools and research goals to seemingly smaller-scale decisions about which scratches in the rock are scratches and which are feathers.

It makes sense then that we might want to explain changes in specimen preparation by changes in specimen interpretation. As Lukas wrote and Joanna agreed, “I could easily imagine someone preparing this specimen, trying to free the bones from the rock matrix, inadvertently destroying the fossilized traces of feathers.” I think today’s preparators would agree with you, based on their experience with the difficulty of spotting feather traces and even distinguishing fossil bone from its matrix, in many cases. I might object, however, to blaming the poor unappreciated “invisible technicians” for what was actually an epistemological belief at the time – i.e., that dinosaurs didn’t have feathers, so it wouldn’t have occurred to anyone to look for them, scientist or technician. As Shapin and others point out, invisible technicians are made visible only when problems happen, and then these workers become convenient places to lay the blame.

Regardless of who gets the “blame” for the effects of now-rejected past beliefs, I think today’s science technicians are generally very aware of their responsibility for producing reliable specimens (and experiments too). For example, preparators have a community-wide joke about “making foramina”. Foramina are natural holes in bones, such as where blood vessels pass through bone, so this joke centers on the irony of preparators creating holes in fossils with their tools, either by mistake or to please a researcher who may say things like “I want to see foramina in this part of this bone, so that this bone can be identified as belonging to this species…” This joke is common and popular among preparators, but the one time I witnessed researchers hearing the joke, they didn’t laugh.

I think it’s the weight of responsibility that makes preparators laugh at the idea that, firstly, they might create holes in fossils, and, secondly, that these artificial holes might be interpreted as natural features. Preparators know that they control how a prepared fossil looks (even though scientists imply that preparators’ work is not important by omitting descriptions of it from publications). Thus preparators are wary of the necessity and the difficulty of navigating the gray boundary between good fossil preparation and forgery. For example, one preparator I interviewed was working on skin impressions around a hadrosaur skeleton, and he agreed with many preparators that preparation work can sometimes seem like sculpture:

CW: I’ve had two preparators now tell me about Michelangelo’s quote about “The piece is already in the stone”.
Preparator:  Yeah [laughs]
CW: Have you heard that before?
Preparator: Yeah, you’re right. Yeah. And that’s kind of what I thought in exposing the skin that I’ve done over the last few days, that like the skin was in there, it was under several inches of sandstone, and you could imagine if you didn’t see it when you came across it you would go through that until you got to the bone that’s on the other side of the skin. And luckily if you find it then you can follow it and not break that skin barrier, and then you’re kind of exposing it, and you could almost imagine just kind of making it up as you went along and using the tool to make a skin pattern on sandstone and just kind of sculpt the skin, you know, which I guess in fossil forgeries that’s done quite a bit, you know, where the things that are for sale on the black market and parts that are missing are just kind of carved out of matrix to look like the fossil. So it definitely is done, I would say, by unscrupulous people for the wrong reasons. But that’s not what I’m doing. [laughs]

Based on quotes like these and jokes about making foramina, it's clear that today’s preparators are very aware of the problem Lukas suggests for preparators in the past – of missing information that they may not be looking for and also, crucially, of MAKING information that may not be original to the specimen, either inadvertently or on purpose. So whether these kinds of changes actually occur as a result of the work of data preparators, in any field, is less interesting, in my opinion, than what we believe to be “real” and “natural”, and thus informative about the world. Data – from specimens, patients, experiments, etc. – are only relevant in that they function as foundations for our knowledge claims. Then these objects’ “real”-ness or artifice doesn’t matter unless that status influences how they are used to support knowledge claims. I find how we interpret the world to be more interesting than how the world actually “is”, since that’s impossible to know. What do you think? Should we be studying ontology, or epistemology, or maybe their intersections?

Thanks for reading, and keep up the good blogging!