Topography as a navigational tool

This is a quote that I read and then for­got where in the attic I’d left the book. Whenever I found the book I’d then dis­cover Delphi was’t in the index and, as vir­tual worlds are not a pri­or­ity for me, I’d put down again with the inten­tion to return to it later. Finally it’s all come together.

The con­trast between uphill and down­hill views has a rather won­der­ful side-effect, which is quite rel­ev­ant to the design and exper­i­ence of vir­tual worlds. Delphi is a one-sided site in which you are never dis­or­i­ent­ated. Down­hill is south­ward, facing the val­ley and the Gulf of Cor­inth and the warm Greek sun. Uphill is north­ward, facing the tower­ing gray cliffs of Mount Parnas­sus. There is no con­fu­sion in Delphi today, just as there was none two thou­sand years agom for a tour­ist try­ing to find the sta­dium high up on the north end of town, If you climb uphill with the sun at your back you will inev­it­ably arrive at the sta­dium. You will be at an elev­a­tion 400 feet higher than the ath­letes’ gym­nas­ium in the lower town. Think about how you might incor­por­ate a slope into the topo­graphy of your vir­tual site so that your vis­it­ors have a con­stant reminder of the logic of the lay­out, that there is an uphill side.

O’Neill, R. & Muir, E. 1998. >Web Developer.com Guide to Cre­at­ing 3D Worlds. New York: Wiley & Sons.

(pp. 22–23)

Look­ing uphill to the Temple of Apollo, Delphi

The value of models in history

Play the Past, a group blog about the use of video games in his­tory teach­ing is pro­du­cing some excel­lent posts. It’s par­tic­u­larly use­ful to me given my atti­tude to teach­ing with video games. It’d be nice to say I’m scep­tical, but that implies I’ve had a crit­ical look at the evid­ence and come to a reasoned con­clu­sion. It’d be fairer to say I’m unreas­on­ably hos­tile and there’s been a couple of good posts that show that.

Prac­tical Nec­ro­mancy for Begin­ners by Shawn Gra­ham would have been a big help to me if it had been my intro­duc­tion to mod­el­ling soci­et­ies. I didn’t like mod­els for his­tory when I was intro­duced to them. What I saw was a big soci­etal model with no real jus­ti­fic­a­tion for the arbit­rary pro­cesses that made up the model and then a detailed dis­cus­sion of one of the sub-processes without much ref­er­ence to the rest of the model, all presen­ted as “this is how soci­et­ies are”. Shawn Gra­ham could have made a massive change to my first reac­tion thanks to one simple sen­tence:

Ah. So you’re not sim­u­lat­ing the past, but rather how you think x worked in the past.”

It’s small dif­fer­ence but it’s a subtle dif­fer­ence. He goes on to explain how you don’t have to accept any model he puts for­ward, you can change it. Again this adds sup­port for accept­ing or reject­ing a model. It also helps his mod­els have con­sequences if you change the inputs and are not purely about dynamic thrust­ing arrows in excit­ing shapes and intersections.

There are places I could grumble. One of the bene­fits of com­puter mod­els is that read­ing code requires close-reading which is a use­ful his­tor­ical skill. Yes it is, but my gut reac­tion is why learn close-reading for his­tory by examin­ing code, when you could close-reading for his­tory by examin­ing his­tor­ical texts? The gut is not noted for its large num­ber of brain cells, and this example demon­strates why mine is no genius. Close-reading for code should be sim­pler. It should be unam­bigu­ous and lack­ing the com­plex­it­ies of mean­ing that words in his­tor­ical text have. It’s an easier way of learn­ing the skill that you can then take into more com­plex situ­ations effect­ively mak­ing a shal­lower learn­ing curve.

The only thing I could ser­i­ously say is miss­ing is that mod­els can also be help­ful when they break down — if it’s a good model. If you have some­thing is that work­ing very well in most situ­ations, but breaks down at a spe­cific time or place, that’s a big clue that some­thing really inter­est­ing is hap­pen­ing at that time or place. His­tory is com­plex, so it’s cer­tain that any model will break down sooner or later, but maybe a recog­ni­tion that a model that breaks isn’t the same as a failed model would be helpful.

The other entry is older, but again shows me that I’m miss­ing some­thing, Sid Meier’s Col­on­iz­a­tion: Is it offens­ive enough? by Tre­vor Owens. I saw a brief flurry of tweets and I wasn’t inter­ested. I’ve played Col­on­iz­a­tion, it’s a very basic game with not much adher­ence to the his­tory of the times. My feel­ing was you could spin up some­thing about his­tor­ical rel­ev­ance, but the lim­it­a­tions of tech­no­logy would mean that it would have to be lim­ited by design. If you actu­ally read the post, you’ll see Tre­vor Owens goes way bey­ond that.

He points out that a game based in that period is by neces­sity going to have racist over­tones, because the beliefs of the times and the col­on­isa­tion pro­cesses were racist. Yet he makes a very sens­ible point that the Tri­an­gu­lar Trade makes no appear­ance in Col­on­iz­a­tion. You see North Amer­ica. You deal with Europe at a dis­tance, but there is no Africa. I can see why the design­ers balked at mak­ing own­ing negro slave a fun activ­ity. At the same time it does no favours to the African-American exper­i­ence to com­pletely ignore that the slavery exis­ted. It’s not simply the lim­it­a­tions of PCs at the time that meant slavery was omit­ted. It was a choice. That blind­ness can be seen in other ways that we use or remem­ber the past. It’s another good post.

I dare say there are shal­low and vapid obser­va­tions on the use of games in teach­ing. You can find shal­low opin­ions in all fields, so it would be weird if teach­ing through gam­ing was exempt. What the Play the Past is show­ing is that it’s not inher­ently the case that teach­ing with com­puter games has to be shal­low. So I’ve tried to work out why I have an imme­di­ate pre­ju­dice against teach­ing through gaming.

One reason might be pur­it­an­ical. If it’s fun it’s not work. Games are sup­posed to be fun, ergo they can’t be work. It might be silly, but pre­ju­dices don’t have to be rational. Oddly another reason might be dia­met­ric­ally opposed to this. I’m not a huge fan of com­puter games. I’ve been temp­ted by Rome: Total War, that I’ve seen has hit the Mac App Store. That’s partly due to see­ing it used in the semi-documentary Time Com­mand­ers which I liked. Pre­ju­dices don’t have to be con­sist­ent either.

I think another reason is that I haven’t grasped what games mean in the mod­ern media land­scape. I can see why someone would ana­lyse the use of the past in films or books. Why not games? I don’t play many games, but it ignores the fact that many people do. It’s a massive industry that is rivalling the film industry in reach into house­holds. People like me will dis­ap­pear through nat­ural wastage in time, but I won­der if people pro­du­cing really clever and pion­eer­ing research and teach­ing tools are going to find a frus­trat­ing bar­rier of ignor­ance for the next few years.

For sens­ible com­ment­ary on games and mod­els, see also the post that Shawn Gra­ham linked to from his post, Stu­dent Cre­ated Sims as His­tor­ical Inter­pret­a­tions.

How to navigate a Viking longboat with a king, some bees and a DC-8

Jo Marchant has repor­ted on a new paper, On the trail of Vik­ings with polar­ized sky­light: exper­i­mental study of the atmo­spheric optical pre­requis­ites allow­ing polar­i­met­ric nav­ig­a­tion by Vik­ing sea­farers, for Nature news. She also adds more on her own blog includ­ing the link to the paper that you can access for free.

The research is part of an ongo­ing pro­ject by a col­lect­ive of sci­ent­ists to see if the Vik­ings could have nav­ig­ated the Atlantic in cloudy weather using polar­ised light viewed through crys­tals. There is no doubt that the Vik­ings were mas­ter nav­ig­at­ors, the dif­fi­culty is how did they navigate?

If the sun is vis­ible then they could have used a solar com­pass. This is a bit like a sun­dial. You make a wooden disc with a gnomon stick­ing up out of it. Then you scratch out a line show­ing where the edge of the gnomon shadow reaches dur­ing the day. Where it’s shortest is south and the oppos­ite dir­ec­tion is north. Now, when you go sail­ing the next day, you float it in a small tub of water — to make sure it’s hori­zontal — and then look at the shadow, when you turn the disc so the shadow matches the line you can work out where north is. It does mean know­ing morn­ing from after­noon, so that’s a prob­lem round noon if you’re not care­ful, but there error would not be huge. It wouldn’t work for weeks on end, because the path of the Sun would move in the sky, but it would be good for a month around mid­sum­mer. At least if there’s no cloud. That’s not always the case in the North Atlantic. Storms and fog are com­mon and if there’s neither of those then there’s often cloud.

Hor­váth et al. have been fol­low­ing the tale of the sun­stone, More

Phototripping

I’ve been busy recently which a couple of things that will be blogged here sooner or later.

In the mean­time I took an after­noon off a couple of Sundays ago to take some pho­tos with a new lens. It’s for some­thing else I’d like to blog about on pho­to­graphy. There’s been some inter­est­ing stuff writ­ten, but I’m not com­fort­able with the idea that pho­to­graphy can present an object­ive record of a view. It’s not simply that pho­tos can be manip­u­lated, it’s not pos­sible to present a default view.

I’ve also tweaked my Flickr set­tings again. I’d love to be able to release them as BY-SA. At the moment they’re BY-NC-SA, because there’s issues with com­mer­cial rights and prop­erty rights. It’s partly related to the Eng­lish Her­it­age rights grab/assertion on pho­tos of Stone­henge. It’d be easy to por­tray them as a greedy quango hold­ing back research, but there are big­ger issues at stake. Which will need another blog post.

In the mean­time my most recent pho­tos are on Flickr.

Nine Ladies stone circle near sunset

Nine Ladies stone circle near sunset

More on Copernicus

There’s a good post up at The Renais­sance Math­em­aticus by Thony C. He dis­agrees with me about Coper­ni­cus and ellipses for the very good reason that Kepler had a big advant­age over Coper­ni­cus. Kepler had access to Tycho Brahe’s data. Tycho massively improved the accur­acy of obser­va­tions. Thony C. also argues that accur­acy was the goal — quite reas­on­ably given why Coper­ni­cus wanted to revise the Ptole­maic sys­tem. There­fore the increased accur­acy would be enough win over people in the astro­nom­ical community.

I’m not sure to what extent the astro­nom­ical com­munity were in step with pub­lic opin­ion in the Renais­sance. There are reas­ons to say astro­nom­ical spec­u­la­tion was freely passing into the wider cul­ture of the time. Pos­sibly it means that if there had been bet­ter data one of the big set-pieces of Reli­gion vs. Sci­ence wouldn’t have happened. That’s not some­thing I’d want to defend too strongly, but it shows that a rigid view of Sci­ence fight­ing Reli­gion is going to give a you nar­row view of the past.

It’s never too early for wine?

It’s nice when things con­nect. There was a press release last week on the earli­est known winery being found in Armenia. The paper is Chem­ical evid­ence for wine pro­duc­tion around 4000 BCE in the Late Chal­co­lithic Near East­ern high­lands. Alas, it’s not Open Access so if you want to read it can you can’t use a lib­rary or blag a copy it’ll be expens­ive. It was covered in other blogs, so I wouldn’t nor­mally men­tion it.

Mean­while another release has come out about some genetic work on grapes in PNAS. I found this while work­ing on AoB Blog. Genetic struc­ture and domest­ic­a­tion his­tory of the grape is open access, but you’ll have to do a search on the title as the DOI isn’t work­ing (as I write this). This dates the domest­ic­a­tion of grapes to no later than 5,000 years ago — and the likely centre of domest­ic­a­tion is the region between the Black Sea and Caspian Seas.

After much fid­dling about I’ve man­aged to set up a map on AoB Blog show­ing where the winery is. You can decide for your­self if the two approaches are com­ing to the same loc­a­tion for the ori­gin of wine.

Would Copernicus have been more convincing if he’d been more accurate?

As a follow-up to yesterday’s post, I was won­der­ing if Coper­ni­cus would have been more con­vin­cing if he’d used ellipses in his model instead of circles. By using circles Coper­ni­cus had to use epi­cycles like Ptolemy, though not so many. Still, it gave the impres­sion that epi­cycles were neces­sary. If that’s the case then why not have a sta­tion­ary Earth as well? The dis­cov­ery that plan­et­ary motion would be bet­ter described by ellipses didn’t come about till Kepler’s work almost a cen­tury later. As far as the post title goes, I think Dr* T’s The­ory #1 applies here: Any tabloid head­ing that starts ‘Is this.…’, ‘Could this be…’ etc. can be safely answered ‘No’

So my post title is a bit of a cliché, but the reason I’ve used it is that if the answer is no, then some­thing strange is hap­pen­ing. More accur­ate is less convincing?

The reason I think that is that Coper­ni­cus’ model wasn’t isol­ated from the rest of thought for that period. It used and built on a num­ber of assump­tions of the time. One of those ideas was the cre­ation of the uni­verse by a per­fect being. Another was the idea that a circle was a per­fect shape, derived from clas­sical geo­metry. By telling people the Sun was at the centre of the uni­verse and not the Earth, Coper­ni­cus was ask­ing people to make a big shift in their think­ing. A lot of people thought it non­sense. If he’d made the orbits ellipt­ical as well then many people who would have been will­ing to listen to Coper­ni­cus’ ideas would have balked at that, redu­cing his poten­tial audi­ence fur­ther. In terms of num­bers, the pop­u­la­tion of math­em­at­ic­ally minded people who could exam­ine his work was small enough already.

If he’d reduced the num­ber of ini­tial read­ers fur­ther, would his ideas have spread enough for oth­ers to pick them 50 years later? It’s impossible to say, but if Coper­ni­cus hadn’t given Kepler the idea of a put­ting the Sun at the centre of uni­verse, could Kepler have dis­covered it inde­pend­ently? It’s hard to say but, given how Kepler struggled with let­ting go of circles and using ellipses, I think it’s unlikely.

This is why I’m wary of his­tor­ies of sci­ence that are purely about who got it right and who got it wrong. Coper­ni­cus’ use of circles isn’t ‘right’, but it was neces­sary at the time.

I’ve «cough» bor­rowed the por­trait of Coper­ni­cus from Prof Reike’s page on Coper­ni­cus. It’s well worth vis­it­ing if you want to find out more about the astronomer.

You can read more about Kepler’s dis­cov­ery of the ellipt­ical path of plan­ets at:
Boc­caletti 2001. From the epi­cycles of the Greeks to Keplerʼs ellipse — The break­down of the circle paradigm

Copernicus and the Star that was bigger than the Universe

I’ve been try­ing to watch Cos­mos by Carl Sagan. I’ve never seen it and it’s prov­ing to be a bit of a struggle. He def­in­itely can write. Some of the sequences are fant­astic, but some of it is badly dated. The thing that really grates to me is his dis­missal of Ptolemy and his geo­centric uni­verse. For Sagan at best Ptolemy’s sys­tem held back astro­nomy by 1,500 years. At worst he’s only worth men­tion­ing to say he’s dead wrong, like in the first episode.

It’s not really fair to lay into Sagan for his atti­tude to Ptolemy. His work is a product of its time and it was writ­ten over thirty years ago. But the idea that Ptolemy was clearly wrong seems to the pop­u­lar under­stand­ing of Renais­sance astro­nomy. The ques­tion here is Why did some people oppose the helio­centric the­ory of the uni­verse? not Who in their right mind would accept it? It over­looks the power of the Ptole­maic sys­tem. If you fol­lowed Ptolemy’s work you could pre­dict where the plan­ets would be with enough accur­acy for naked-eye astro­nomy. If Coper­ni­cus had only used simple circles, then his model might have seemed bet­ter, but he too needed to add epi­cycles and fudges to make his sys­tem match the observ­able sky. It needed fewer epi­cycles, but it was hardly perfect.

Pop­u­lar belief is that the prob­lem was solved when Galileo picked up his tele­scope and proved the helio­centric the­ory. In fact a recently pub­lished paper by Chris­topher Graney, The Tele­scope Against Coper­ni­cus: Star Obser­va­tions by Ric­ci­oli Sup­port­ing a Geo­centric Uni­verse in the Journal for the His­tory of Astro­nomy shows that the tele­scope could have dealt a ser­i­ous blow to the Coper­nican model of the uni­verse.
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Linking things

Mick Mor­rison has been irked.

Hate it when journos don't bother to for science reporting.

I’ve run into a sim­ilar prob­lem with AoB Blog. The way the feeds work, the head­line can point to an external link and not the blog post. So if the post is just “Hey look at this!” I can put the external link into the head­line so that Twit­ter and Face­book feeds point dir­ectly to the linked page. If that’s a story about a sci­ence paper where should I link to?

For AoB Blog I’ve decided that the sci­entific paper is what mat­ters. If the news story links to the paper, I can link to the news story so the finder gets credit and a page view. If they don’t I’ll link to the paper in the head­line and not the news site. They’ll still get a credit but only in the text of the blog post — which people fol­low­ing AnnBot on Twit­ter or Face­book will miss.

What I’m won­der­ing is if I should just make that a gen­eral rule. Some report­ers genu­inely do add some­thing when writ­ing up a story. Many oth­ers reheat high­lights from the press-release. If I can find the ori­ginal papers when think­ing about link­ing to a story then I’m sure I could reheat the abstract and put the dir­ect link into the ori­ginal paper. I would like to give credit to people who point at inter­est­ing things. At the same time how much does it add to link to a news story that adds noth­ing and doesn’t help you find a paper? Is it enough to simply add Heads-up AP with a link to ap.org as a credit?

Do more Research Blog­ging is usu­ally near the top of my to-do list. One of the fea­tures I really like about the Research Blog­ging web­site is the insist­ence on link­ing back to the source paper if you want to be aggreg­ated there. I think the idea of hard and fast rules for blog­ging is a bit silly, but I am think­ing that if the story is about the research and the news site is not adding any­thing then it’s the research that should be the high­lighted link in a blog post.

In related news the redesign of AoB Blog seems to be fin­ished. The thing I like on the front page is the fea­tured items slider that it pulls the first DOI link from a post and makes a Get Art­icle but­ton. Now the AoB redesign is fin­ished I’m in no rush to change this site’s tem­plate, but when I do I might look at whether I can reuse the code for my website.

Archaeologists prove the secret to a successful date is knowing what is on the menu

Bora Bora Dining and Food at Sunset

Know­ing about food will increase the suc­cess of your dating

ResearchBlogging.orgLook­ing from the out­side, one of the most under­rated areas of archae­olo­gical research at the moment is the Archae­ology of the Pacific. It’s pos­sible to make excit­ing dis­cov­er­ies any­where in the world. In Poly­ne­sia though, it’s hard not to. The reason is that Poly­ne­sian archae­ology has an odd con­tra­dic­tion. There’s been some excel­lent research done in the Pacific, yet it’s likely to be wrong. The prob­lem is in the dating.

Take Easter Island. The big story there is the eco­lo­gical col­lapse of the island. We know there was an eco­lo­gical col­lapse because set­tlers arrived AD 800, their set­tle­ment pat­terns changed around AD 1200 and when they were dis­covered by Europeans there were rel­at­ively few people on the island. We know they were on the island in AD 800 because that’s been radiocar­bon dated. If those dates were wrong, like if they were too old and set­tlers arrived later, then it’s not just a mat­ter of tweak­ing dates on the timeline in text­books. Sud­denly there’s no native-caused pop­u­la­tion crash to explain.

Across the Pacific it turns out that many radiocar­bon dates are too old. Test­ing the human factor: radiocar­bon dat­ing the first peoples of the South Pacific by Petchey et al. (2011) is a paper that helps explain why, but also shows which dates are accur­ate. First here’s a brief reminder on how radiocar­bon dat­ing works.
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