Unglazed rectangular chōhō-bachi pot, signed by Tōsen of Tokoname and made of reddish clay (shidei). It features a refined gaku-iri or gaku-men style: the term gaku refers to the visible "frame" on the body of the piece, while iri alludes to its "interior" arrangement, creating an elegant framed effect that adds depth and distinction to the piece. The composition is finished with delicate, finely crafted, cloud-shaped feet (kumo-ashi).
Tōsen (陶仙) was a potter active in Tokoname during the Taishō Period, a key era in the development of bonsai pots. He specialized in unglazed pieces with simple lines and balanced proportions, designed to enhance the tree without overshadowing it. He worked with reddish Shudei and Shidei clays. Like many Tokoname artisans, his biography is little known and is reconstructed primarily through the signed works that have survived. Today, his pots are valued for their technical quality and for faithfully representing the classical Tokoname tradition.