This one asks them to look at nothing at all. On a stretch of flat upland pasture near Barnane in County Tipperary, there is an earthwork that no longer exists above ground, leaving a curious kind of presence: a place recorded, catalogued, and given a grid reference, yet offering no visible trace to anyone standing on it.

The earthwork appears on the first edition Ordnance Survey six-inch map, a meticulous mid-nineteenth-century survey that captured Ireland's landscape in extraordinary detail, including countless low earthen features that would not survive the following decades. At Barnane, the map confirms the feature was present before 1840, but by 1904 it had gone, likely levelled during the agricultural improvements and land clearances that reshaped so much of rural Ireland between those two dates. It sat in upland pasture, close to a cluster of enclosure sites to the east, which suggests it was once part of a broader pattern of early settlement or land use in this elevated corner of North Tipperary. Enclosures of this kind are typically circular or sub-circular earthen banks, sometimes associated with early medieval farmsteads, and their grouping here hints at a landscape that was once considerably more structured than it now appears.

What remains is cartographic and archival, a ghost preserved in map ink rather than in soil. The ground itself gives nothing away.