Somewhere in what is now a working farmyard north of Fearaun House in County Kildare, there is a feature that exists almost entirely on paper. A small circular enclosure, roughly eighteen metres across and ringed by a band of planting, appears clearly on the first edition Ordnance Survey six-inch map of 1839, then vanishes from every subsequent edition without explanation. No earthwork, no depression, no visible trace of any kind survives on the ground today.

The 1839 OS mapping was among the most methodical surveys ever carried out in Ireland, and the cartographers were generally careful to distinguish functional agricultural features from ornamental ones. The circular form here, combined with its encircling vegetation, suggests it may have been a designed landscape element associated with Fearaun House, of the kind that landed estates in the late eighteenth and early nineteenth centuries sometimes incorporated into their grounds. Circular enclosures with decorative planting were occasionally used as eye-catchers, garden features, or informal pleasure grounds. Whether this one was ever completed, or simply proposed and partially laid out before the estate altered its priorities, is not recorded. What is clear is that by the time later surveyors revisited the area, it was no longer considered worth marking, and the farmyard that now occupies the site has absorbed whatever physical evidence remained.