Others exist only as whispers in the soil, legible solely from the air, in the right light, at the right moment in the growing season. In a tillage field near Grange in County Wicklow, something of that second kind waits beneath the surface, its outline surfacing briefly each year as crops grow unevenly above whatever lies below.

What was recorded here is a cropmark, the faint circular or curvilinear trace of a possible enclosure. Cropmarks form when buried features, ditches, walls, or pits, affect the moisture and nutrients available to plants above them. Crops growing over a filled-in ditch tend to grow taller and greener; those over a buried wall tend to struggle. From ground level, the difference is imperceptible. From the air, under the right conditions, a pattern emerges. The Grange example was caught on aerial photographs taken by M. Moore in July 2006, during what was presumably a dry spell that brought the underlying geometry to the surface. What the enclosure represents, a ringfort, a field boundary, a ceremonial site, something else entirely, is not something the photographs alone can answer.