Previously discussed here.
- Enclosures and “Celtic fields”; [above: ] these are almost by definition not quite regular, often this may be perceived as product of topography, but when you consider the lowlands, where aerial photography has revealed thousands of examples the pattern is remarkably irregular, even if 2 right angles, or 2 sets of parallel sides [parallelogram / rhombus] occur, squares are exceptional.
- Built environments; [above: ] While the majority of British Iron buildings are considered to be round,
smaller structures like 4 post structures [granaries] are always slightly
irregular with one posthole slightly out of position.
- Celtic art and design; one of the defining characteristic of “Celtic” and other Prehistoric material is the general lack of right angles and the reliance of arcs or curve; this curvilinear approach seems apparent in most aspects of material culture where evidence is available.
- Square structures; I am aware three types of exceptions;
- Roman-Celtic temples [above: ]
- Burial enclosures [below: ]
- Burial pits
Coincidentally, it is the Roman fort at Vindolanda that provides an intriguing strand of evidence; when the fort is rebuilt in the Severan Period [per. VI] there is an annex with rows of stone roundhouse foundations. I would interpret these as being built to house hostages from those tribes in the intervening or adjacent areas between Hadrian's Wall and the Antonine frontier held to ensure their cooperation, [ as suggested by Tony Birley ]. What is important about these buildings is that they imply that intended occupants, presumable British, won’t live in the rectangular structures normally built by the Romans.