Meet the maker: Marugama Seitōjo (Katō Shōhei, art name Yōkun)

Marugama Seitōjo is a Seto ceramics workshop active since the late Edo period, now in its sixth generation. The fourth generation head, Katō Shōhei, worked under the personal art name Yōkun (窯薫) and produced ceremonial pieces connected to the Japanese imperial family around 1940, alongside signed individual works marked with his tomobako inscription and Shōhei seal.

Shino yunomi meoto pair with thick white feldspar glaze and iron spots, Marugama kiln Seto

Shino yunomi meoto pair, tomobako inscribed 窯薫作, Marugama kiln, Seto

Who was Katō Shōhei?

Marugama Seitōjo (丸窯製陶所) is a Seto ceramics workshop with roots stretching back to the end of the Edo period, when it was founded by the first generation to carry the name Shōhei (庄平). In the early Meiji period the workshop produced vases, garden pots, ceramic pillows and jūbako storage boxes.

The name Shōhei has been passed down through the generations of kiln masters since, in the tradition of many Seto workshops where a workshop name carries forward rather than staying tied to one individual. The fourth generation to hold the name led the workshop through its most historically significant period, from the early Shōwa years through the postwar era, working under his own personal art name, Yōkun (窯薫), for individual pieces alongside the workshop's larger commissioned work.

In 1937 he made and presented a large round table decorated with a sometsuke blue and white bird and flower design to the former imperial house of Nashimoto no miya. The workshop's own printed history describes further ceremonial and decorative commissions from this period, including offerings connected to the 2600th anniversary of the Japanese imperial era in 1940 and pieces made for temples including Kashihara Jingū, Atsuta Jingū and Zenkō ji.

Katō Shōhei also held public office in Seto, serving four terms on the city council from 1947 and later three terms on the Aichi prefectural assembly, alongside leadership roles in the local ceramics industry cooperative.

On 5 June 1942, the workshop was formally established as a private limited company, Yūgen gaisha Marugama Seitōjo. From that point the workshop increasingly focused on large scale ceramic pieces and expanded into technical and scientific ceramic products such as pot mills, alongside its ongoing decorative and tableware production. Marugama Seitōjo is still active today, now led by the sixth generation to carry the name Shōhei, at the same address in Seto.


What sets his work apart

Yōkun's personal pieces favour Shino-yaki, a thick white feldspar glaze that pools unevenly and lets the reddish clay body show through where it thins, scattered with dark iron spots that surface during firing. The look is deliberately rough and organic rather than smooth or symmetrical, often marked by visible finger ridges near the rim from hand-forming. Yet his overall output was much more diverse than these tea wares alone suggest.

Beyond this rustic aesthetic, Yōkun and the Marugama Seitōjo workshop were deeply rooted in Seto sometsuke, the refined tradition of classic blue and white porcelain with intricate underglaze brushwork. The workshop's craftsmanship spanned everyday functional ceramics such as vases and stacked food boxes to grand, custom commissions for temples and the imperial family. Today, the historic Seto workshop continues its lineage, balancing traditional pottery with technical porcelain production.


How to recognise a genuine piece

  • Personal pieces by the fourth generation Katō Shōhei are rarely signed on the ceramic body itself. Attribution relies primarily on the accompanying tomobako, which is inscribed with the object's name, signed 窯薫作 (Yōkun saku), and marked with his red 庄平 (Shōhei) seal.

  • Beyond the box, the physical characteristics of his Shino work are worth knowing when assessing a piece: a thick, milky glaze with visible iron spots, uneven pooling that reveals the reddish clay beneath, and distinct finger marks near the rim or foot from hand-forming and dipping. These are hallmarks of Shino-yaki generally, so they support an attribution rather than confirm one on their own.

  • Some pieces are also accompanied by a printed workshop certificate. A certificate referencing Katō's ongoing term on the Aichi prefectural assembly since 1947, together with its present-tense reference to the imperial branch titles, dates that certificate specifically to between 1947 and 1950, since those titles were abolished in October 1947. The certificate confirms the date of the paperwork; the ceramic piece itself may be from the same time or slightly earlier.

As with many Japanese tea ceramics, individual boxes can also carry a separate, more personal inscription in flowing cursive script, sometimes a poetic name (mei) given to that specific piece.


Signatures and shiori of Katō Shōhei in our archive


Meet the Katō Shōhei pieces in collection


About Shino ware

Shino-yaki originated in the Mino region during the Momoyama period, the first white glaze ever developed in Japan, born from potters trying to recreate the porcelain then arriving from China. It never left, and the town of Seto, one of Japan's Six Ancient Kilns, carried the tradition forward for generations after. The glaze is thick feldspar, applied heavily and left to move on its own during firing, pooling in some places and pulling thin in others until the reddish clay beneath shows through. Dark iron spots surface where the clay and glaze meet the heat unevenly, and the result is never quite the same twice, even from the same hands. Where Hagi ware changes slowly over years of use, Shino wears its transformation on the surface from the moment it leaves the kiln.

→ Want to know more about how to care for Shino ware? Read the care guide for chawan and yunomi here.


Sources

  • Physical examination of the tomobako inscription, seal, and certificate

  • Information shared by dealers and specialists in Japan at the time of purchase

  • Official workshop website: Marugama Seitōjo company history


Browse all tea ceremony items


Next
Next

Meet the maker: Matsuura Mugen (松浦無元)