A circular enclosure, invisible to anyone walking the pasture, appears as a cropmark when viewed from above, a ghostly ring traced out by the differential growth of grass over buried archaeological features beneath the soil.

Cropmarks form when buried ditches or walls affect how crops and grasses grow above them. Filled-in ditches retain more moisture, producing lusher, faster-growing vegetation, while buried stone foundations dry out the soil above, stunting growth. The result, particularly during dry summers, is a faint but legible pattern readable only from altitude. The Ballydowling enclosure was captured in exactly these conditions by aerial photographer Michael Moore on 16 July 2006, a midsummer day when the grass had drawn the outline of what lies below into something a camera could catch. Circular enclosures of this kind are found across Ireland and can date from the Bronze Age through to the early medieval period; they served variously as farmsteads, ceremonial spaces, or settlements, though without excavation it is rarely possible to say which. The one at Ballydowling has not, on the basis of available information, been excavated, meaning its precise date and function remain open questions.