The enclosure at Ballyganner in County Clare belongs to this ambiguous class. Identified from aerial photography and added to the Record of Monuments and Places in 1996 as a potential site, it was visited the following year by inspectors who found no physical trace of an enclosure at all. What they saw instead was a natural subcircular ring of hazel growth around a clearing, a shape that from the air had looked convincingly like the remains of a settled or enclosed space, but which refused to yield any such evidence when examined directly.

The site sits at the northern edge of a southwest to northeast ravine, in rough pasture and hazel scrub, and forms part of a large multiperiod field system, meaning the surrounding landscape carries traces of land use from several distinct eras, layered over one another across centuries or millennia. That broader field system has its own monument record, and a confirmed enclosure lies roughly 127 metres to the northeast. The proximity of that confirmed site is part of what keeps Ballyganner on the record rather than off it. Aerial photography has a strong track record of revealing features invisible at ground level, particularly crop marks or soil discolourations that only emerge under specific conditions of light, season, or drought. The 1997 inspection may simply have caught the site on an unrevealing day, or the hazel may genuinely be doing nothing more than growing in a circle, as vegetation sometimes will.

What makes Ballyganner quietly interesting is not what is there but what cannot be settled about it. It occupies a strange bureaucratic and physical middle ground, present in the record as a question mark, a shape that resembles something without yet being it.