3D imaging

Recording the Sheelas

The sheela-na-gig is one of Ireland’s most mysterious historical artefacts, and one that has fascinated professionals and amateurs alike since the antiquarian days. What is a sheela-na-gig? It’s a carving of a female figure (mostly – there are also male figures, or seán-na-gigs), often crudely executed, with the focus on the hands reaching down to display the vulva. The female is often described as aged, or a ‘hag’ and the carvings have certain features that are common to many, such as staring eyes, ribs, stylised hair and breasts.

This is a romanesque arch at the Nuns’ Chapel in Clonmacnoise. Can you make out the tiny exhibitionist figure carved into one of the lozenges?

The carving of Sheelas probably started in the 12th century, as part of the corpus of fanciful or grotesque carvings that were used to decorate romanesque churches. Some are still found in romanesque contexts, especially outside of Ireland. In Ireland, two possible romanesque examples I have seen are at Liathmore and at the Nuns’ Chapel at Clonmacnoise. However, most Irish sheelas appear to have been either separated from their original locations or carved later, possibly up to the late 1500s. They are found on medieval churches, 17th century castles, the sides of old barns, at holy wells, and indeed in museums. Sheelas have been stolen, lost or destroyed and many of the existing sheelas are damaged.

Does this help? This is just a screen capture of one of DH_Age’s 3D renderings – view it properly online here. This may be a very early sheela or simply one of the grotesque figures associated with romanesque carvings. The tiny figure is grinning and has its legs over its head, exposing the vulva and anus

There are multiple theories as to what a sheela represents and how they were ‘used’ on structures. Were they intended to attract and ward off the evil eye? To serve as a warning against lust? To invoke the sacred feminine through the powerful image of the vulva? The hag, or cailleach, is a vibrant motif in Irish mythology as a form taken on occasion by a goddess. Several sheelas are associate with saints, and believed to be representations of them.

At St Gobnait’s Church in Ballyvourney it is customary to rub the sheela as part of the rounds

We have visited many sheelas (and one seán) and noted that it is always difficult to photograph them well. They are invariably out in the open and very worn. The details are difficult to discern and often obscured by lichen. Even where they are indoors, they show the signs of of exposure to the elements, so it is impossible to view them in what would have been their freshly-carved state. And of course they are deteriorating with every passing decade.

From Jack Roberts’ resource map (see below) – a collection of southwestern sheelas

Fortunately, there’s this great project out there run by DH_Age, or Digital Heritage Age, to record all the sheela-na-gigs using the latest 3D imaging technology. Hats off to Gary Dempsey and Orla Power for undertaking this incredibly important initiative with the support of The Heritage Council. They are working away on visiting all the Sheelas in Ireland and already have a substantial body of images to view online.

The Aghadoe sheela is damaged (the feet are broken off) and covered in patches of lichen

Take a look at their collection of Cork sheelas to see how a good 3D image can reveal the true nature of a carving. The Aghadoe (Co Cork) example is particularly striking to me, because we visited it recently and I found it quite hard to photograph. The 3D image shows the breasts, the ribs, how one arm goes behind the legs to display the vulva while the other holds something aloft, and the curious bumps on the wrists that defy interpretation.

The DH_Age’s 3D rendering of the Aghadoe Sheela: the clarity of detail is impressive, but view it online for the full effect

The Aghadoe Sheela-na-Gig has a complicated history of being placed in different locations but it is currently on the side of a dovecote of indeterminate date and looking like at any moment it will be covered by the thick growth of ivy all around it. There was a tower house here at one point, and the sheela was reported as ‘probably from the castle’ and as ‘lying beside it.’ It’s a little tricky to track down now, so it’s a big thrill to find it and to see that, for the moment at least, it’s in the relatively protected position of being cemented into the dovecote wall.

Jack Roberts’ sketch of the Aghadoe Sheela

Our old friend Jack Roberts has written extensively about sheela-na-gigs and has published a marvellous resource – a one page fold-out map of the Sheela-na-Gigs of Ireland. You can order this from Jack’s site. His illustrations, as usual, are superb, and his artist’s eye managed to make out much of the detail that my camera couldn’t catch.

The Aghadoe Sheela is currently cemented on to a dovecote

I will come back to sheela-na-gigs in a future post but for now, you can check out these resources, for Ireland and for Britain, to learn more.

Revealing Rock Art: 150 Years of Images

This week a powerful image from Ken Williams of Shadows and Stone (copyrighted, used with permission) lit up the Irish Rock Art Facebook Page (180,000 people had seen it at last count, and it’s been shared more than 1500 times). The photograph, taken with Ken’s signature blend of natural and artificial light, was of a stone in Kerry often known as the Staigue Bridge Rock Art, although technically it’s in the townland of Liss.

As it turns out, this is one of the best-documented rock art panels in Ireland, with images dating from the middle of the nineteenth century to the present day.

Taken on a recent visit to Liss/Staigue Bridge Rock Art site. This is probably what a casual visitor will see. Can you make out any carvings?

The response to this photograph highlights several important features of Irish rock art. First of all, it seems people are hungry to know more about these enigmatic carvings, and yet rock art is one of the least known aspects of Irish archaeology. Time after time, as Robert and I present exhibitions or give talks, we meet up with a near-universal response of “How come we’ve never heard about this before?”

Another view of the top section of the panel

Secondly, a photograph like this is not normally what you observe in the field. Commonly, rock art (and this one is no exception) is actually difficult to see under most lighting conditions. This rock is just off a popular hiking trail and the vast majority of walkers are unaware of what is a few meters from their path. Even if the route went right alongside it, most walkers would pass by without noticing anything unusual.

This will give you an idea of the extent of the panel

Thirdly, it is no longer possible to record rock art by any of the traditional methods that were in common use up to the 1990s. Nowadays, recording techniques that do not impact in any way with the rock surface are preferred, and that limits us to what can be imaged through photographic and scanning technology.

Aoibheann Lambe’s virtuoso photograph – this is the panel in the second photograph, taken from almost the same angle but under perfect natural lighting conditions. © Aoibheann Lambe

There are currently three ways in common use to photograph rock art so that the carvings will show up. The first is to use the natural low, slanting, shadow-casting, light at sunrise or sunset. Rock Art Kerry, the work of archaeologist Aoibheann Lambe, has an outstanding photograph of the rock surface using only natural light. Given our climate, it is likely that many visits to the rock in all kinds of temperatures, early in the morning or late in the evening, were necessary before the perfect shot was possible. Aoibheann’s Facebook page is the place to be these days for new finds – she is making discoveries at a breathtaking pace!

Another of Aoibheann’s photographs – this one shows the extent of lichen growth on the rock surface, which often functions to obscure carvings. © Aoibheann Lambe

The second is to use flash photography – a technique that Ken Williams has perfected and uses to great effect to show up even faint carvings. We’ve seen Ken working – this isn’t a mater of a simple flash on a camera – multiple flashes are deployed with a skill that comes from long experience, and respond to an electronic trigger on his camera.  If you haven’t already done so, a visit to his site is an absolute must for anyone interested in rock art – or indeed in Irish archaeology.

Finola and Robert from Roaringwater Journal and Ken Williams of Shadows and Stone at Derrynablaha in Kerry

The third technique is that of photogrammetry. In essence, this is the combination of multiple high resolution photographs to construct a 3D image of a rock surface. The Discovery Programme has been sponsoring 3D imaging of various national monuments, including Ogham Stones and Sheela-Na-Gigs, for some time. Under this program, The Dingle Museum (Músaem Chorca Dhuibhne) has produced a series of 3D images, including an excellent one of the Liss/Staigue Bridge rock art panel.

The top panel rendered in 3D – this is a screen capture. © Corca Dhuibhne 3D 2017

It is particularly exciting because it’s unusually clear (rock art 3D images can suffer from lack of clarity for a variety of reason) and also because this technique allows an image of the whole panel, whereas photography can only capture pieces at a time.

These stills have been captured from the 3D images on the Museum site but they do NOT compare with the experience of viewing and manipulating the 3D images on screen. It’s brilliant work, so please go to their page for the real thing. © Corca Dhuibhne 3D 2017

But back to the past, when it was still possible to produce drawings of the carvings. Back, in fact, to the 1850s! There were two Irish antiquarians called the Rev Graves. The better-known one was the Rev James Graves of Kilkenny, but the one we are concerned with here was the Rev Charles Graves, Bishop of Limerick and a noted mathematician, scholar, antiquarian, and President of the Royal Irish Academy. He was fascinated by Ogham and on a trip to view Ogham stones in Kerry he came across other ‘inscribed rocks’ of a type he was unfamiliar with. He wrote up his findings and presented them to the Academy in 1860.

Taken from the Wikipedia article on Charles Graves. Image above by Anonymous – Church Bells (1874–1875)) W. Wells Gardner, Publisher, London, Public Domain

The good Bishop had none of our modern scruples about interfering with the rock surface, or removing the turf to see what else he could fine. He did both: three feet of turf was stripped back to reveal the extent of the carvings and a rubbing was made from the whole surface, which was later converted to a survey-drawing. This, to this day, is the only drawing we have of the complete carving.

When I wrote my thesis on The Rock Art of Cork and Kerry in 1973 I said this about Charles Graves:

The first paper devoted to rock art in Ireland was by Rev. Charles Graves. In 1860 he read a paper to the Royal Irish Academy entitled “On a previously undescribed Class of Monuments”. His paper, mainly concerned with Co. Kerry, is still very valuable and his drawings and observations are often more accurate and more reliable than many later accounts.

My own drawing was done in 1972. The technique I used then was to chalk in the carvings and trace them onto clear plastic film. That tracing was then re-traced on to good quality paper using indian ink and a stipple technique and then photographically reduced by a professional printing firm. It is naturally an imperfect and subjective method, but long practice enabled me to produce surprisingly accurate renditions which stand up well to modern recording techniques.

I confined my drawing to the main area of carving and used Graves’ drawing as an additional illustration

There are few examples of Irish rock art with the pedigree of Staigue Bridge. It is classic cup-and-ring art in its execution but also contains the unusual elements of very large circles surrounding small cupmarks. It is enormous – a fact that would never have been appreciated if Graves had not determined to find the true extent of the carved surface (although of course we do NOT condone this practice now). It has a literature that goes back a century and a half, and was one of the first pieces of Irish rock art to be described and illustrated. It’s a national treasure.