Arisawa Family Residence

Arisawa Family Storehouse: How to Read a Wall in Tano

Four thin ridges of grey tile run straight across the white wall of this storehouse, evenly spaced between waist height and the eaves. They look ornamental, and in a way they are, but their first job is plain: to throw rainwater clear of the plaster before it can soak in. Stand in front of the Arisawa Family Storehouse for a minute and the wall starts to make sense as a piece of weather engineering rather than a backdrop.

The building is a kura, a thick-walled storehouse of the kind that well-off Japanese households kept for rice, tools, documents and anything that needed protection from fire, damp and theft. This one is small, two storeys, with an earthen core finished in lime plaster and a tiled gable roof. It was put up in 1938, in the early years of the Showa era, and stands behind the family's main house, tucked against the east side of a detached annex.

You will find it in Tano, a town on the east bank of the Nahari River near the Pacific coast of Kochi Prefecture. Tano is often introduced as the smallest town in Shikoku by area, but for two and a half centuries it was anything but minor: a timber port and a market town that served as the commercial and administrative hub of eastern Tosa, the old name for this part of Kochi.

Why a Small Storehouse Became a Cultural Property

The Arisawa storehouse is a Registered Tangible Cultural Property, the lighter of Japan's two main heritage listings for buildings. Where the more famous Important Cultural Property and National Treasure designations single out exceptional, closely protected monuments, the registration system, introduced in 1996, casts a wider net. It takes in structures that are generally more than fifty years old and worth keeping for their design, their regional character, or simply because they could not easily be built again. The storehouse was registered in December 2003, listed as a work that serves as a model of its type.

What it models is the Tosa storehouse: a regional building tradition shaped by one stubborn fact of life on this coast, the weather. Kochi sits in the path of the typhoons that sweep up from the Pacific each year, and it records some of the heaviest rainfall in Japan. Local builders answered with two techniques you can see on this wall.

The first is the plaster itself, Tosa shikkui. Ordinary lime plaster is mixed with a seaweed-based paste to make it workable; that paste softens when it gets wet, which is a problem on a wall that faces driving rain. Tosa plaster leaves the paste out and binds instead with straw fibre that has been left to ferment, producing a thick, slightly cream-coloured coat that holds up to weather far better. It is applied heavily, almost sculpturally, and the masons who worked it were specialists.

The second is the row of tiles, called mizukiri-gawara, or water-cutting tiles. Each band projects from the wall like a miniature eave and intercepts the sheet of water running down the plaster, breaking it and shedding it outward so the surface below stays drier and the storehouse interior stays free of damp. Because the work was skilled and expensive, a generous run of these tiles also quietly advertised that the household could afford it. The Arisawa storehouse carries four tiers, a confident number, with a board-clad lower section, the koshi, guarding the base against splashback.

What to Look For

Begin with the tiles and count up. The lowest band sits above the timber base, then three more climb toward the eaves, each casting a thin line of shadow that shifts as the light moves through the day. Up close you can see that they are real fired tiles set into the plaster, not a moulded imitation; the craft is in how cleanly the masons folded them into the wall so that water meets a hard edge and falls away.

Notice the colour. Tosa plaster is not the bright chalk-white of much Japanese stucco. Fresh, it carries the yellow-brown tint of the straw worked into it, and it pales toward a soft ivory as it ages and weathers. Against that wall, the dark grey of the tiles and the worn timber of the base boards read as three quiet, harmonised tones.

Keep the scale in mind, too. This is a working storehouse with a footprint of about thirteen square metres, roughly two and a half by three and a half metres at its core, with a single-mat storeroom added beside the entrance on the north side. It was never meant to impress; it was meant to keep grain dry through a typhoon. That it does so with this much care is the whole point, and it is a useful lens for the rest of Tano, where the same idiom repeats along the streets on storehouse after storehouse.

Around Tano

The storehouse makes most sense as one stop on a slow walk through the old town. From the late Edo period, Tano was run by a circle of merchant houses, the so-called Five Houses of Tano, who grew rich on timber, shipping and rice. The grandest survivor of that world is the Oka Goten, completed in 1844 as the residence of the leading Oka family and used as the official lodging, or honjin, for the Tosa lords when they passed through on the long alternate-attendance journeys to and from Edo. Restored and open to visitors, with a small admission charge, it is the one building in town you can properly go inside, and it sets the standard against which the surrounding houses and storehouses can be read.

Tano was also a place of ideas. In 1853 the domain placed its eastern district magistrate's office here, and the following year added a domain school, the Tano Gakkan, which trained a remarkable run of late-Edo figures. Among them was Kiyooka Michinosuke, who led the band of twenty-three loyalists remembered in the town's Twenty-Three Loyalists Park, men who petitioned for the release of imprisoned reformers and were executed for it in the turbulent years before the Meiji Restoration.

Against that background, the cluster of registered houses, the Arisawa residence among them, with its main house, annex and storehouse listed together, is less a collection of separate monuments than the fabric of a single old town that happened to survive. A reminder before you set out: these are private homes. The Arisawa storehouse is appreciated from the street as part of the streetscape, not toured from the inside.

Getting here is straightforward. The Tosa Kuroshio Railway's Gomen-Nahari Line runs along the coast to Tano Station, a few minutes' walk from the old centre, and the town is roughly an hour by car from Kochi Ryoma Airport. A flat, compact townscape makes it easy to cover on foot in an afternoon.