"We can agree I think, that the ditch inside the bank (as it is in most cases) is not defensive. It SEEMS that something is being contained within rather than being kept without."
I believe this line of reasoning is a getting a bit closer to a possible "purpose" . There is a "threat " that is being contained . The ditch and bank and possibly stone circles could serve a function of closure . The last monumental event at Tomnaverie was the building of the stone circle.
This tradition could extend into the Iron Age where we find so called defensive sites with the same containment architecture as henges .
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