Antique Japanese Kamakura Period Yamajawan Fused Kiln Wasters Sanage Tokoname

This is an antique Japanese Yamajawan (mountain tea bowl) kiln waster cluster, believed to date from approximately the Kamakura period (12th–13th century).

The piece consists of several ceramic bowls that became fused together during firing in a traditional Japanese kiln. The bowls were originally stacked for firing, but excessive heat, contact between the vessels, and the surrounding kiln materials caused them to become permanently joined into a single mass.

The piece was acquired from an antique dealer in the Tokai region of Japan. Based on its ceramic characteristics and construction, I believe it may have originated from an old kiln in the Sanage or Tokoname area, both historically important pottery-producing regions in central Japan. However, the exact kiln site and original excavation location are unknown.

Features

The most striking characteristic of this piece is the series of overlapping bowls, with their rims and walls visibly stacked and distorted by the firing process.

Large amounts of fired clay, kiln debris, sand, and small stones remain attached to the ceramic surfaces, creating a rugged, almost sculptural appearance.

Some areas display pale grayish-white and bluish glaze-like surfaces, along with small accumulations of translucent turquoise-blue glassy material, likely formed during the high-temperature firing process.

The combination of the distorted ceramic forms, fused surfaces, and heavily encrusted kiln debris provides a fascinating glimpse into traditional Japanese pottery production.

Historical Background

Yamajawan were everyday ceramic bowls produced in large quantities in medieval Japan, particularly in the Tokai region.

Kilns associated with the Sanage and Tokoname pottery traditions were active during the late Heian and Kamakura periods, producing various types of utilitarian ceramics.

Pieces such as this, known as kiln wasters, represent vessels that were damaged or deformed during firing and discarded rather than sold for everyday use.

Today, such objects are of interest as historical ceramic references and as examples of the unpredictable effects of traditional wood-fired kilns.

Although this piece is believed to date from the Kamakura period, its precise age and kiln of origin have not been independently verified.

Details

• Estimated Period: Kamakura period, approximately 12th–13th century

• Origin: Japan, Tokai region

• Possible Kiln Tradition: Sanage or Tokoname area (attribution uncertain)

• Type: Yamajawan kiln waster cluster (fused ceramic bowls)

• Material: Fired stoneware with kiln debris and glaze-like deposits

• Construction: Multiple bowls fused together during firing

• Provenance: Acquired from an antique dealer in the Tokai region, Japan; exact excavation site unknown

Dimensions

• Length: 33 cm / 12.99 in

• Width: 21 cm / 8.27 in

• Height: 16 cm / 6.30 in

• Weight: Approximately 6.5 kg / 14.33 lb

Condition

This piece is in archaeological-style condition, showing substantial deformation, cracks, broken edges, rough surfaces, and heavy accumulations of fired clay and kiln debris.

The bowls are permanently fused together, and some sections are partially embedded in hardened kiln material.

There are visible surface deposits, glaze irregularities, and areas of fragile or protruding ceramic material.

These characteristics are consistent with its nature as a kiln waster rather than a finished ceramic vessel.

The piece is intended for collection, research, or decorative display only, not for practical use.

Please carefully examine all photographs for details of its condition and structure.