The arithmetic alone is curious: nine stones, thirteen hollows, and four of those stones gathered into a cluster known locally as the Seven Fonts. The name does not quite add up, which is part of what makes this group so quietly interesting.

Bullaun stones are boulders into which one or more cup-shaped depressions have been deliberately cut or worn, and they appear across Ireland in association with early Christian sites, holy wells, and ancient routeways. These examples in Brockagh sit close to St Kevin's Road, the old pilgrimage path through the Wicklow Mountains to Glendalough. The connection to St Kevin is reinforced by an entry on the Ordnance Survey six-inch map, which marks a site roughly 100 metres to the northwest as "Thornbush (site of), St Kevin's Keeve"; a keeve being an old word for a tub or vessel, sometimes applied to natural rock formations with a basin-like form. Writing in 1972, Healy recorded one of the boulders in detail: a flat-topped granite stone measuring 1.2 metres by 1.1 metres and 0.5 metres high, with a single central basin approximately 0.37 metres across and 0.11 metres deep. It is a modest hollow by any measure, yet its careful dimensions suggest it was considered worth recording precisely.

The site lies along one of the most historically layered walking routes in Leinster, and the stones are scattered across open ground rather than enclosed within any formal monument. Visitors following St Kevin's Road should look carefully at the boulders in the field to the north; the basins can be easy to overlook unless the light catches them at the right angle.