A Thomasson Archive

Hyperart Guidelines

Akasegawa and his collaborators developed a typology over years of collective fieldwork, published in full in the Thomasson Illustrated Encyclopedia (トマソン大図鑑). The categories used in this archive are adapted from that system, consolidated where the original types blur together and renamed where the original Japanese required cultural context to read.

Pure Staircase: A staircase that goes up and comes back down with nothing at the top: no door, no entrance, no purpose. Usually there was once a door. The handrail is often still maintained. The original Thomasson, discovered by Akasegawa in Yotsuya in 1972.
Useless Door: A door that cannot be used: blocked with concrete, sealed behind a later wall, or opening onto empty air. It retains the full dignity of a door. In some cases it stands alone, with no wall around it at all.
Useless Window: A window that has been filled in or made permanently inaccessible, but whose frame or outline remains. The care taken in blocking it is often what makes it a Thomasson rather than simple renovation.
Orphaned Eaves: A roof overhang or canopy with nothing left beneath it to protect. The window or door it once sheltered has been removed or sealed, and the eave stays on, sheltering nothing. Called hisashi in the original typology.
Ghost Wall: The flat impression of a demolished building left on the surviving wall of its neighbor: rooflines, floor levels, staircase angles, chimney shadows. The building is gone; its outline stays printed on the one next door. Called the A-bomb type in the original typology.
Elevated Type: A normal object (a door, a handle, a switch, a sign) stranded at an abnormal height, unreachable without equipment that is no longer there. Usually the result of a staircase, platform, or mezzanine being removed. The object is intact; what used to reach it is gone.
Sealed Surface: A wall where something has been filled in, but the filling is legible. A doorknob still protrudes. A window frame shows through plaster. A tap emerges from concrete. The opening is gone; its outline stays in the surface.
Swallowed Object: A structure being consumed by its surroundings — a post embedded in poured concrete, a fence absorbed into a growing tree, a sign half-buried in accumulated ground. The city or the natural world has grown around it without removing it.
Roadside Remnant: A post, stump, bollard, or object whose original function is no longer apparent, maintained or simply left, attached to a surface, serving nothing. Includes the severed stumps of removed telephone poles, called the Abe Sada type in the original typology.
Broken Sign: A sign that has lost its letters, symbols, or meaning through weathering, vandalism, or removal, and still presents itself as a sign while communicating nothing. Called Uyama in the original typology, after the first example found.
Uncategorized Thomasson: A Thomasson that does not fit the existing types, or whose type is unclear. Akasegawa expected the taxonomy to be incomplete. Submit what you find.

The central question is whether an object appears to be maintained even though it no longer does anything. A Thomasson had a purpose once; the purpose is gone, the object is still there, and somebody (a building owner, a city, a landlord) has either decided to keep it or never quite gotten around to deciding otherwise. It does not need to be freshly painted, but it should not be collapsing either, since pure neglect is its own category and not this one.

The function should be genuinely absent rather than just dormant. A door that is rarely used is still a door, while a door that has been sealed, bricked over, or left opening onto a two-story drop has crossed into something else. The same logic applies to windows, staircases, switches, and signs.

It helps to remember that the strangeness lives in the object and not in the photograph. A beautifully composed image of an ordinary downspout is still an ordinary downspout, and a blurry phone picture of a staircase to nowhere is still a staircase to nowhere, and very welcome here.

What does not qualify: intentional public art, pure neglect, the merely old or ugly, and works in progress.

When in doubt, ask whether the object seems kept past the point where keeping it made sense. If you found yourself slowing down in front of it and could not quite explain why, that may be enough.