The stone, roughly oval and measuring just under eighty centimetres in length, sits partially sunk into the ground, and the circular hollow carved into its upper face, thirty centimetres across and equally deep, has been repurposed as a small planter. It is an quietly odd domestic detail, and one that carries considerably more history than a typical garden ornament.

The stone is a bullaun, a type of boulder, usually of granite or other hard stone, that bears one or more cup-shaped depressions ground into its surface. Bullauns are found across Ireland and are frequently associated with early medieval ecclesiastical sites, though their original function remains debated; some scholars connect them with grinding or processing, others with ritual use, and in many cases the two purposes may have overlapped across centuries of use. This particular example was discovered in a pile of rubble in the north-western corner of the garden before being relocated to its current position as a landscape feature. What lends it additional interest is its proximity to a cluster of medieval monuments roughly 110 metres to the north-north-west: a medieval church and a round tower, both recorded in the same area of Ardrahan. Round towers, the tall, tapering stone structures built from around the ninth century onwards, were typically constructed adjacent to monastic settlements, suggesting the wider landscape here was once part of a functioning ecclesiastical complex. The bullaun may well have originated within or near that complex before finding its way, at some unknown point, into rubble.