At Graigueshoneen in County Waterford, an ancient enclosure exists as little more than a ghost in the landscape. Nothing marks it on the ground; no earthwork, no visible boundary, no stone. What gives it away is a cropmark, the kind of faint discolouration in growing crops that aerial photography occasionally catches, where buried ditches or banks cause the soil above them to retain moisture differently, making the outline of a long-vanished structure briefly legible from the air.

The mark in question describes a rough circle roughly 35 metres across, sitting on a gentle south-facing slope. Circular enclosures of this kind are found throughout Ireland and can date to a wide range of periods, from the Bronze Age through to the early medieval. They were used variously as farmsteads, ceremonial spaces, or burial grounds, and without excavation it is rarely possible to say which. At Graigueshoneen, no excavation appears to have taken place, and so the enclosure retains the particular ambiguity that comes with being known only from the air. It is a shape without a story, or at least without a story that has yet been recovered.