Others exist only as shadows in a field, visible from the air on the right summer morning when the crops grow unevenly over buried ground. The enclosure at Scart in north County Cork belongs to this second, quieter category. What survives above ground is essentially nothing; what was recorded is the ghost of a fosse, a defensive or boundary ditch, curving from east to south across the north-western corner of a field, its outline betrayed only by a cropmark.

Cropmarks form when buried features such as ditches or walls affect how plants grow above them. Soil that has filled an old ditch tends to retain moisture, producing lusher, taller crops directly overhead; a buried wall does the opposite, starving roots and leaving a paler stripe. Seen from ground level, the difference is invisible. From the air, particularly in dry summer conditions, the patterns can be read like a faint map of what once stood or was dug into the earth. The arc at Scart was captured in an aerial photograph taken in July 1989 as part of a Cork aerial survey programme. The surviving cropmark traces only a portion of what was presumably a larger circular or oval enclosure, its full shape now lost or undetected. Notably, another enclosure sits approximately fifty metres to the south, suggesting this corner of north Cork was once a more organised or inhabited landscape than its present agricultural appearance implies.