In a field near Levitstown in County Kildare, a circle lies buried beneath the soil, invisible to anyone walking past but briefly legible from the air. It shows up as a cropmark, the faint but telling difference in the colour and growth of crops that appears when buried features, in this case the filled-in line of a fosse, or enclosing ditch, affect how plants draw moisture from the ground above them. That ghostly ring, estimated at around twenty metres in diameter, is all that survives of what was probably a ring-barrow or ring-ditch, the kind of circular funerary or ceremonial enclosure that appears throughout prehistoric Ireland.

Ring-barrows and ring-ditches are broadly similar in form: a roughly circular area defined by a ditch, sometimes with an internal or external bank, typically associated with burial or ritual activity during the Bronze Age, though some examples span other periods. The distinction between them often comes down to whether a central mound survives, which in this case cannot be confirmed from the aerial evidence alone. What the photograph does show is that this site is one of two such features visible in the same area, suggesting the landscape around Levitstown once held some significance as a place of burial or assembly. The specific aerial photograph in question, taken as part of the Cambridge University Collection of Aerial Photography, captures both sites as cropmarks, the kind of fleeting evidence that can disappear in a wet summer or a different crop rotation and never reappear quite the same way again.