Others exist only as faint shadows in the soil, visible not to anyone walking the ground but to a camera carried high above it. At Ringaheen in County Wexford, a circular enclosure roughly eighteen metres across reveals itself only as a cropmark on aerial photographs, the buried outline of a ditch causing the grass or grain above it to grow at a slightly different rate, producing a tell-tale ring that is otherwise invisible at ground level.

This kind of feature is generally classed as a ring-ditch, a term covering a broad range of circular or near-circular ditched enclosures that appear throughout the Irish landscape from the Neolithic period onward. Some enclosed burial mounds, others may have defined small farmsteads or ritual spaces, and many remain ambiguous without excavation. The Ringaheen example sits on a slight south-east facing slope, placing it in the kind of gently angled terrain that farming communities across many periods tended to favour. What makes its position particularly interesting is its proximity to other known features: it lies approximately ten metres south-east of a corner of a separate rectangular enclosure, and both sites fall within the boundary of a broader field system. That clustering suggests this was not an isolated monument but part of a worked and organised landscape, layers of activity that have left only these ghostly outlines behind.