In the townland of Cussan in County Kilkenny, a feature photographed from the air was catalogued in 1987 as a potential site, its neat rectangular outline suggesting the kind of enclosure that archaeologists associate with early settlement, burial, or ecclesiastical use. It had all the geometry of something significant.

When someone went to look in 1989, the mystery dissolved quietly. The shape on the aerial photograph, taken from a GSI survey, was not an ancient enclosure at all but an old field boundary, the kind of earthwork that generations of farmers built and rebuilt across the Irish landscape to divide grazing land or mark ownership. These boundaries can read very convincingly from altitude, their slight ridges casting shadows that mimic the profile of more archaeologically charged features. The 1987 listing had flagged it honestly, using the cautious designation of potential site, and the follow-up inspection simply closed the question. It is a small example of how aerial survey and ground-truthing work together, and also of how ordinary agricultural history can wear the silhouette of something older.