At Coole in County Tipperary, what appears to be an ordinary agricultural field conceals, just beneath the surface, the ghostly outline of an ancient enclosure, one that only became apparent when photographed from the air in the summer of 1989. The photograph captured a cropmark, a subtle variation in the colour and height of growing crops caused by buried features affecting soil moisture below, tracing the arc of a curved fosse. A fosse is simply a ditch, typically dug to define or defend a boundary, and here its curve suggests it once formed part of a curvilinear enclosure, the kind of roughly circular enclosed space associated in Ireland with early medieval settlement and farming.

The aerial photograph, taken on 16 July 1989, reveals not just this single arc but also a series of contiguous fosses immediately to the north, which may represent an associated field system, the kind of organised land division that would have accompanied a domestic or agricultural settlement. Roughly fifty metres to the south-southwest, a second, incomplete curvilinear enclosure has been identified, suggesting that this corner of Tipperary may preserve the faint remains of a small cluster of enclosures rather than a single isolated feature. Whether the two enclosures were contemporary, or represent different phases of activity in the same landscape, is not something the cropmark evidence alone can resolve. That uncertainty is itself part of what makes the site quietly compelling; the photograph captured a moment of legibility in a landscape that is otherwise mute.