Regional registry
Ohio
3 documented locations. Others may exist; funding to check ran out.

Dunbar Flats Carpeting Pattern House
Inside and out, a one-story demonstration house on the north edge of Dunbar Flats is sheathed in oversized painted panels reproducing twelve commercial carpet patterns once stocked by the Mid-Ohio Institutional Floorcovering Cooperative. A small sign credits maintenance to the Dunbar Flats Area Improvement Association, though the porch enclosure appears newer than the rest of the structure and suggests at least one undocumented stabilization campaign. The building was reportedly erected as a full-scale sales environment where school administrators, motel owners, and parish hall committees could judge carpeting under "actual corridor and sunlight conditions" before placing bulk orders. One hook detail still visible from the road is that each room has its own labeled pattern family, including a former "high-traffic beige" vestibule that seems to have been repainted in a slightly different beige, likely the beginning of a local dispute worth returning for. Parking is informal along the gravel shoulder.

Merrit Vale Curb Radius Parade Ground
Preserved in a fan arrangement around a central flagpole at the east edge of Merrit Vale, beside a township maintenance garage and a striped lot that appears larger than current demand requires, six full-scale street-corner curb designs form the Township Curb Radius Parade Ground. A small sign credits the Merrit Vale Township Road Standards Committee, though the painted turning templates on the pavement suggest the site was used for more than display. Local reports indicate it was built in the late 1980s so township trustees, school bus contractors, and snowplow operators could compare corner geometries before a downtown resurfacing project. The outer two curbs are labeled only by radius and one of the plaques appears to have been replaced after a mounting dispute or theft; access hours remain unclear.

The Municipal Egg
A 14-foot fiberglass egg mounted on a concrete apron outside Bellamy City Hall. Commissioned for the 1976 bicentennial as a tribute to the town's poultry-shipping era, it has never received an official designation, and appears in municipal records variously as a sculpture, a seasonal decoration, and a utility cover.