Horyuji Temple Masu

Six Wooden Boxes, Six Different Amounts

In the Gallery of Hōryūji Treasures at the Tokyo National Museum, between cases of seventh-century gilt-bronze Buddhas and a famous gilded banner, sit a handful of plain square boxes carved from wood. They look like something from an old kitchen. They are, in fact, official measures, and the reason they survived for more than five centuries is that each one quietly contradicts the others.

Every box in the set was used at Hōryūji as a one-shō measure. A shō was, and still is, a unit of volume for rice, grain, and sake. Yet when curators measured the surviving boxes, their capacities ranged from about 1.47 litres to roughly 1.87 litres. All of them counted as "one shō" inside the same temple.

That contradiction is the whole point. Before national standards arrived, a unit of measure was a local agreement, not a fixed quantity, and these boxes are some of the clearest physical proof of it that we have.

From a Temple's Granaries to a Museum Case

Hōryūji stands in Ikaruga, in present-day Nara Prefecture, and traces its origins to the early seventh century. Like many great temples, it was also a landlord. Its estates, including the well-documented Ikaruga-no-shō in Harima (today part of Hyōgo Prefecture), sent rice and other dues back to the temple, and collecting those dues required boxes exactly like these.

The Chinese characters cut into the wood record both dates and purposes. Inscriptions name the years 1456, 1459, and 1474, placing the boxes firmly in the Muromachi period. Others label a box by its job: one is marked as a measure for the Kannon-kō, a devotional assembly held in honour of the bodhisattva Kannon, and another as a jishi measure, used to take in ground rent from tenants. A box was not an abstract instrument here. It belonged to a specific task and a specific account.

The measures left Nara in 1878, when Hōryūji presented more than three hundred of its treasures to the Imperial Household. That collection passed to the state after the Second World War and is now housed in the museum's dedicated Gallery of Hōryūji Treasures. Most of those objects are Buddhist images and ritual goods from the seventh and eighth centuries, so the medieval measuring boxes sit slightly apart, a reminder that a temple's history is administrative as well as religious.

Why Plain Boxes Earned a National Designation

Japan named the set an Important Cultural Property on 27 June 1959, registering it under the category of historical materials rather than fine art. The official designation covers six boxes. The museum's own published commentary describes five of them as one-shō measures and details their capacities and inscriptions; the slight difference in count reflects how the boxes are grouped, and the national database figure of six is the authoritative one.

Their value lies in evidence, not beauty. In the medieval centuries, estates and temples often kept two sets of measures on purpose: a larger one for taking grain in and a smaller one for paying it out, with the gap between them quietly favouring the collector. Standardisation came only late in the sixteenth century, when Toyotomi Hideyoshi's land survey fixed the Kyoto masu as the reference for the entire country. Boxes that predate that reform are rare, and a dated, labelled group preserved together is rarer still. The Hōryūji measures let historians see medieval weights and measures as objects rather than as abstractions in a document.

Seeing the Measures in Context

The Gallery of Hōryūji Treasures occupies a spare, low-lit building by the architect Yoshio Taniguchi, opened in 1999 at the western side of the museum grounds in Ueno Park. The lighting is kept deliberately dim to protect fragile pieces, so allow your eyes a moment to adjust. The measuring boxes are not always on view, since the gallery rotates its more delicate holdings, so check the current display list before a special trip.

When the boxes are out, look closely at the inscriptions cut into the wood and at how the inner walls differ in height from box to box. That variation is the evidence itself. The ground floor of the same building holds the celebrated rows of small gilt-bronze Buddhas, and the upper floors show calligraphy, textiles, and lacquer, so the measures fit naturally into a slower, reading-led visit rather than a quick look.

Ueno Park surrounds the museum with other collections, a wide approach lined with trees, and easy access from Ueno Station. Pairing the Hōryūji gallery with the museum's main Japanese galleries makes for a full half-day, and the park's cafés and benches give a place to rest between buildings.