The ruin itself

The standing wall is not a model. It is a photographic capture of the real stone, made by a technique called Gaussian splatting: several hundred photographs taken from many angles are processed into millions of tiny coloured, semi-transparent blobs suspended in three dimensions. Together they reproduce not just the shape of the building but the way light actually fell on it on the day it was photographed. Nobody has modelled the masonry; the weathering, the lichen, the robbed courses and the chipped mouldings are the real ones.

Why capture it this way

A photograph of the priory is a beautiful thing and this project is made by someone who takes them. But a photograph is one viewpoint, fixed for ever, and a visitor cannot walk round it. A computer-modelled reconstruction can be walked round, but everything in it is somebody's drawing — the stone is invented, the weathering is invented, the specific broken edge of a specific mullion is invented.

A splat is neither. It is a living record: the real building, in three dimensions, that can be turned, approached, pulled about and zoomed into, and it holds up close in a way a model never does because there is nothing in it that was made up. That combination is the point of using it here. It takes the actual feel of standing in front of the ruin — the scale, the texture, the way the light sat on it that morning — and puts it somewhere a great many more people can reach it, in as authentic a form as the technology currently allows. Somebody in Australia can get closer to this wall than most people who drive past it every week.

What the capture got wrong, and why it has been left alone

Every image used here was taken from ground level, on foot, with a handheld camera. The ideal capture would have been made by drone, and the difference shows: the higher the eye travels up the wall, the fewer angles the process had to work from, and the softer the result becomes. The gable, the upper tracery and the turret heads are the least well resolved parts of the whole model, and they are the parts a drone would have solved outright. That remains the obvious upgrade if the opportunity comes.

The light on the capture day was poor and, more of a problem, constantly changing — which is to say it was a normal day in Teesside. A splat records the lighting it was given, so shifting cloud during a shoot bakes inconsistency straight into the model. It is visible if you look for it: two faces of the same wall, captured perhaps twenty minutes apart, sit at noticeably different brightnesses, as though the sun were in two places at once. Nothing can be done about that after the fact.

The technique also has a signature failure, and it is visible here. Where the capture had too few viewpoints — thin air against sky, the edges of the turrets, the top of the gable — the process leaves stray blobs behind, which read as faint streaks and wisps coming off the building. These have deliberately been left in place. They can be cleaned away, but the tools that remove them work by area rather than by judgement, and every attempt to take out the streaks also took out real stone: cusps, the thin mullion stubs in the window heads, the crocketed edges of the niche canopies. The choice was between a tidier sky and a less complete building, and the building won. The streaks are honest artefacts of the method, and they are easier to live with than losing detail that is genuinely there.

Everything else

Every element that is not the ruin — the glass, the altar, the figures, the candles, the low wall — is authored on top of the capture in a 3D web framework, and is stated as reconstruction rather than record.

The glass is a set of images mapped onto flat panes set into the real apertures. The low wall and the altar are built from simple stone shapes and assemble themselves on screen as the sequence runs.

The figures started life as ready-made 3D models of robed men, downloaded free from a library of shared 3D work under a licence that permits reuse with credit — a common way of getting a human figure into a scene without sculpting one from scratch, which is a specialist craft in its own right. Those models were then recoloured black, re-posed so the arms could carry something, and simplified so that twenty-one of them could run in a browser tab without choking it. Their slow sway was animated once and applied to all of them with different starting points, so no two are in step.

The candle flames are not video, and not a repeating animation. Each one is generated by a small piece of code that draws the shape and drives its own flicker from a random number sequence unique to that candle — so twenty-one flames all behave like flames, and no two ever flicker together. The same code drives the light each flame casts on the figure carrying it.

The camera is choreographed against a clock rather than driven by hand, so the sequence plays the same way every time and can be paused or scrubbed. The sound is three separate recordings played end to end, never overlapping.

The account below is offered as background reading. Nothing in this section supersedes English Heritage's own published information for the site, which should be taken as the authority throughout. English Heritage has not reviewed or endorsed this reconstruction, and where anything here differs from their guidance, theirs is correct.

The nineteen numbered panels in the explorable model all describe the surviving east wall, because that is the bulk of what stands. This section covers the rest of the church and the life that went on inside it — very little of which survives above ground, though more than first appears. An outbuilding stands, and the principal gatehouse, and the bases of columns can be read in the ground. The scale of the lost church is in fact perfectly clear to anyone standing on the site: the great lawn running west from the gable is not a lawn laid out around the ruin, it is the church, and it runs the full length of the original building.

The nave. The long western hall where lay people and guests could attend services stretched away from the canons' choir. Only its footprint remains, but its length and width show it was built to hold large congregations on feast days. It is known principally from the excavated plan and antiquarian record. The fire of 1289 appears largely to have spared the exterior shell and the west end, so a substantial part of the nave probably retained twelfth-century Norman fabric while the east end was rebuilt in the Decorated style — a common pattern of piecemeal rebuilding in a house of this longevity.

The transepts. The two arms that made the church cruciform are marked now only by their foundations. They gave the church additional chapels for side altars — a characteristic of Augustinian houses, whose canons were ordained priests and celebrated multiple masses — and served as burial places for the de Brus founders and later benefactors. The south transept is associated in the sources with access toward the cloister.

The choir and presbytery. The holiest space of the church, east of the crossing, where the high altar stood and where the canons spent hours each day and night at the Divine Office. It was screened from the public nave: a private, richly furnished room, furnished with the high altar and the canons' stalls, and closed off from the crossing by a screen. Its east end is the surviving Decorated showpiece. The stalls and screens are not evidenced at Guisborough and are reconstructed by analogy with other houses of the period.

The crossing and central tower. Where nave, transepts and choir met stood the crossing, probably crowned by a central tower carrying the bells that marked the canonical hours. A central tower is highly probable for a house of this wealth, but its form and height are not documented. Its loss at the Dissolution, when lead, bells and stone were stripped, is typical.

The west front. The great western entrance, facing the town, is singled out in early descriptions as especially fine. This was the ceremonial doorway through which processions passed, and the façade that greeted people arriving for worship. The 1289 fire seems to have spared much of it, implying substantial twelfth-century work survived there.

The cloister and claustral range. The cloister was the covered walkway around a central garth, the spine of daily life linking church, chapter house, refectory and dormitory. It lay to the south of the nave, in the usual Augustinian arrangement, with the chapter house on the east range, the refectory to the south and the dormitory above. These buildings are known only from foundations and antiquarian plans, and are understood by comparison with other Augustinian houses such as Bolton, Kirkham and Bridlington.

The chapter house. The canons' meeting room, on the east side of the cloister, where they gathered each morning to hear a chapter of their rule read aloud, confess faults and discuss the business of the house. It was usually the grandest room after the church, with bench seating around the walls, and at a rich house might have been vaulted and elaborately decorated. No above-ground fabric survives.

The high altar. At the east end, beneath the great window, stood the high altar — the focus of every Mass celebrated in the priory, raised on steps and probably backed by a carved reredos. No altar or reredos survives, and the documentary record is effectively silent. Its position and furnishing are inferred from standard practice.

The choir stalls, pulpitum and rood. Rows of carved wooden stalls lined the choir where the canons stood through the long daily offices. A screen called the pulpitum closed the choir off from the crossing, and a second screen a bay further west, facing the nave, carried a gallery and a great painted crucifix — the rood — flanked by figures of the Virgin and St John. The rood was the principal focus of devotion for lay worshippers, who watched the Mass performed beyond it. None of this survives at Guisborough and none of it is documented there; it is reconstructed from the standard arrangement of a wealthy late-medieval English choir.

The Black Canons. Guisborough was a house of Augustinian canons, known as Black Canons from their black habit: a long black cassock, with a black hooded mantle or cappa over it, and — the detail that matters — a white linen surplice worn over the black in choir. That white over black is the visible marker distinguishing a canon from a monk. Benedictines wore black without the white linen; Cistercians wore white. An almuce, a fur-lined shoulder cape, was common for canons in later medieval England but is not documented at Guisborough.

The Divine Office. The canons' day was built around the office, sung at set hours from before dawn until night. The great east window's coloured light fell on the high altar through the morning services; the night offices were sung by candlelight.

A note on the Use of Sarum. This phrase appears repeatedly in any discussion of medieval English worship and is rarely explained, so: a "Use" is a local version of the liturgy — the same Mass and offices as everywhere else in western Europe, but with its own particular order of prayers, chants, processions and ceremonies. The Use of Sarum was the version developed at Salisbury Cathedral, and over the later Middle Ages it spread until it was the dominant practice across most of England, until the Reformation swept it away. Northern England had its own version, the Use of York, which held on longer here than elsewhere. If you have a church background and have never heard of any of this, that is because the whole system was abolished in the sixteenth century and nothing in modern English worship descends directly from it.

The Sunday procession. On Sundays and feast days the canons processed — robed, chanting, carrying cross, candles, incense and holy water. Under the Sarum rite the procession assembled in the choir and moved west through the screens into the nave, out through the west door, around the cloister walk with stations and sung antiphons, and back into the church to a station at the rood before returning to the choir for the Asperges and High Mass.

The rite itself is thoroughly documented. What happened at Guisborough is not. No Guisborough ordinal or processional survives, so the order above is reconstructed by analogy — sensible, well grounded, and probably close to correct, but not a record of this house. Two further cautions apply. As a northern house, Guisborough sat in York-Use territory until Sarum prevailed, and no manuscript exists to settle which was followed here. And a procession was never one fixed thing: the route, the stations, the chants and the ceremony varied with the feast being kept and with the season of the year. There was no single Guisborough procession to reconstruct, even in principle.

The chant. The music would have been monophonic plainchant, not the later polyphony that most people now associate with cathedral music. The repertoire for a Marian house would have included the aspersion antiphons Asperges me and Vidi aquam, the processional hymn Salve festa dies, and the Marian antiphons — Salve Regina, Ave Regina caelorum, Alma Redemptoris Mater.

The sound of the place. A large stone church of this kind produces a very long reverberation — on the order of five seconds at low frequencies and around three seconds elsewhere. This was not an accident of construction but the point of it: the long tail suits monophonic chant, where a slow stepwise melody blooms and overlaps gracefully, and would turn anything faster to mud. Add to that the bells in the central tower marking the hours, soft footfalls on stone, the rattle of the censer chains, and the sound of a large community moving in a space built to carry sound.

The reconstruction distinguishes three levels of confidence, and applies them consistently.

Documented means the feature survives on the building, or is described in a published source. The east wall and everything on it, the fire of 1289, the black-and-white habit of the canons, the four shields flanking the great east window, and the geometrical tracery formerly filling that window are all documented in this sense.

Inferred means the feature does not survive and is not recorded at Guisborough, but is reconstructed from a reasoned argument — standard practice of the period, the arrangement of comparable houses, or the physical evidence of what remains. The choir stalls, the rood, the central tower, the statues in the exterior niches and the route of the Sunday procession are all inferences.

It is worth being clear about what that word means here, because it is easily misread as a polite term for guesswork. Inference is a recognised and everyday part of historical and archaeological practice. When a building survives only as foundations, the reconstruction of what stood on them is inference; when a rite is documented nationally but not locally, applying it to a particular house is inference. It is a disciplined argument from evidence to a conclusion the evidence does not state outright, and it can be examined, challenged and overturned by better evidence. It is not invention, and there is nothing here in the manner of a theme-park medieval castle.

Speculated means the reasoning is thinner — a step further out than inference, but still a step taken for a reason. Where an inference argues from documented practice to a probable fact, speculation reaches for something the evidence cannot really reach: the specific design of glazing that nobody recorded, the arrangement of a particular procession on a particular evening, the precise character of light and sound in a room that has been open to the sky for five hundred years. These choices are grounded in what the period makes likely, and they are not arbitrary. But they are the parts of this reconstruction that would be most readily replaced if better evidence appeared, and they are labelled so that a reader can see where the ground gets soft.

Two things follow. The first is that an inference is not a weaker fact; it is a different kind of statement, and the panels say which they are making. The second is that where the evidence genuinely runs out, this reconstruction says so rather than filling the gap quietly. There are more gaps than a visitor might expect. The literature on Guisborough is thin.

This is a piece of informed picture-making, not a scholarly reconstruction, and there are places where it has knowingly chosen the picture. They are set out here rather than left to be found.

The canons are not dressed correctly, and this is the reconstruction's most significant known inaccuracy. They read as black hooded figures. They should carry a white linen surplice over the black — the single detail that marks a canon out from a monk, and the most likely visual error in any reconstruction of an Augustinian house. Anyone who knows the period will see it immediately, which is why it is declared first.

It was not overlooked. It was researched early, flagged as important, and worried at for some time before being set aside. The figures began as ready-made 3D models rather than as sculpted work, and adding a convincing white over-garment is not a matter of painting a shape white: the surplice is a loose linen garment that hangs, folds and moves independently of the body under it, which is cloth simulation rather than modelling, and technically beyond the scope of this build. The choice was between shipping a piece with a known and declared inaccuracy, and not shipping it. This document is where the debt is paid.

A related, smaller point on colour. Over the cassock the canons wore a black hooded cape or mantle — the cappa, from which the name Black Canons comes — and the figures here do carry that. But the scene is lit by candles, and warm light on black cloth does not read as black. Under the illumination added to this scene the robes take on a brownish cast in places, particularly where a flame sits close. That is a lighting artefact rather than a choice about the colour of the habit, which was black.

The procession is compressed and simplified. It carries a cross and candles. It should also carry incense and holy water, with a thurifer and a bearer for the aspergillum. It approaches the altar directly rather than following the documented Sarum circuit through nave, west door and cloister — because none of those buildings exists to walk through. Two minutes stands in for a rite lasting the better part of an hour.

The scene is a night scene, and the real one usually was not. High Mass was a daylight service. Candlelight was chosen because it is what makes a ruined wall read as an interior, and because it is the only lighting condition under which authored figures sit convincingly inside a photographic capture made in daylight.

The glass is a proposal, not a recovery. There is no drawing, inventory or description of what filled the great east window. The design shown is built from what the period and the region make likely — grisaille relieved by colour — and from nothing specific to Guisborough.

The captured stone cannot be relit. The lighting in a Gaussian splat is baked into the capture. The ruin is therefore lit as it was on the day it was photographed, and the candlelight in the scene falls only on the authored elements. This is a limit of the technique, not a choice.

Small things. The altar's stone texture is stretched on its side faces. The figures' hands are covered. The tracery in the upper windows renders softly. Where these have been noticed and left alone, it is because fixing them would have cost more than they are worth.

Artistic licence is legitimate in a piece like this, provided it is declared. No claim is made to historical authenticity. The claim made is narrower: that the reconstruction is informed, that its evidence is stated, and that a viewer can always tell which parts are the building and which parts are the argument.

Primary sources for the fabric

Victoria County History, North Riding of Yorkshire, vol. II (1923), pp. 352–3 — the fullest published description of the east end, including the lost geometrical tracery and the wheel in the window head, and the four shields on the internal east wall.

Victoria County History, Yorkshire, vol. III, "Houses of Austin canons: Priory of Guisborough", pp. 208–13, via British History Online.

Historic England, list entry 1007506 (Gisborough Priory).

English Heritage, "History of Gisborough Priory".

Print and further reading

G. Coppack & M. Carter, Gisborough Priory (English Heritage guidebook, 2019).

D. H. Heslop, "Gisborough Priory: initial excavation of the priory church 1985", Yorkshire Archaeological Journal 59 (1987), 175–8.

J. E. B. Bruce, "An account of recent discoveries at Guisborough Priory", Archaeological Journal 25 (1868), 247–9.

W. Brown, "The Brus Cenotaph at Guisborough", Yorkshire Archaeological Journal 13 (1895), 226–61.

J. Burton & K. Stöber (eds), The Regular Canons in the British Isles (2012) — Augustinian dress and liturgical practice.

Liturgy, chant and acoustics

Terrence Bailey, The Processions of Sarum — the scholarly reference for processional structure.

The Sarum Rite (sarum-chant.ca), Topical Guide and Companion to the Processional.

The Music and Liturgy of the Medieval Mass and Office (Open Book Publishers, open access), ch. 1.

U. Berardi, "The evolution of the acoustics of a medieval church", Journal of the Canadian Acoustical Association (2020).

1911 Encyclopædia Britannica, "Augustinian Canons"; and "Canon regular" (Wikipedia) — for the black habit and white surplice.

Noted with a caveat

Britain Express, "St Nicholas Church, Guisborough", records medieval glass fragments said to come from the priory east window and places them behind the Brus Cenotaph. Historic England's list entry places the surviving medieval glass in the church's original east window, reset into the west wall of the south aisle. The Historic England location is followed here, and the priory attribution is treated as local tradition rather than record.