A Story of Beginnings Told by the Clay ── The Earth's Memory in the Paleo-Biwa Lake Group

When we talk about what makes Shigaraki ware so unique, it all comes back to its 'clay.' The clay sourced from the Shigaraki region originates from sediment deposited around 4 million years ago when the area was the bottom of a massive lake. This geological layer, formed by the slow accumulation of soil, sand, and the remains of flora and fauna at the bottom of the 'Paleo-Biwa Lake' (the precursor to today's Lake Biwa), is known as the Kobiwako-sōgun (Paleo-Biwa Lake Group). The clay extracted from this stratum turned out to have several properties that made it ideal for pottery.

What's particularly fascinating are two seemingly contradictory properties of this clay. The first is its high 'plasticity' (its stickiness or workability), as it contains many fine particles, making it easy to shape on a potter's wheel. The second is its remarkable 'fire resistance,' which allows it to withstand intense heat, ensuring that even large pieces don't collapse during firing. The abundance of high-quality clay that perfectly balanced these two characteristics is arguably the single greatest reason Shigaraki flourished as one of Japan's premier pottery regions.

Moreover, Shigaraki has long been situated at a crucial transportation crossroads, connecting cultural centers like Kyoto and Nara with the Tokai region. This geographical advantage not only spurred the inflow of advanced techniques and information but also made it easier to ship finished products to major consumer markets. On top of that, the area was blessed with rich forest resources, indispensable for fueling the traditional wood-fired kilns (makigama). Shigaraki ware, therefore, wasn't just a happy accident; it was an art form destined to take root in this very land, born from a complex interplay of geological wonders and favorable geographic and cultural conditions.

A Mirror to the Times ── From Farm Tools to Fine Art to Everyday Items

The history of Shigaraki ware is a testament to its incredible flexibility, as it has constantly adapted its form to meet the demands of each era. When full-scale ceramic production began in the Kamakura period, the primary products were practical tools for farming communities, such as large jars (kame), pots (tsubo), and mortars (suribachi). During this time, Shigaraki ware was an essential part of daily life, prized for its durability far more than for any decorative qualities.

This perception shifted dramatically from the Muromachi to the Azuchi-Momoyama period, when the culture of the tea ceremony flourished. Tea masters, including the legendary Sen no Rikyū, saw in the rustic, unadorned Shigaraki ware—which farmers had used as seed pots or water jars (mizugame)—the embodiment of 'beauty in utility' that was central to the spirit of wabi-cha. Through a unique aesthetic concept known as mitate, which involves repurposing an object to give it a new context and value, they elevated these simple, functional items to the status of exquisite flower vases and water containers (mizusashi) for the tea ceremony. In this way, Shigaraki ware was transformed from a humble daily necessity into a work of art that symbolized the spiritual culture of Japan.

Entering the Edo period, the introduction of the climbing kiln (noborigama)—a technology that utilized hillsides to fire large batches of pottery at once—reestablished Shigaraki as a major production hub for everyday items for the general populace. Then, in the modern era from Meiji to Showa, ceramic braziers called 'hibachi' became a massive commercial success, leveraging the 'heat-resistant and durable' nature of Shigaraki clay to capture, at one point, 90% of the national market. It was also during this period that the tanuki figurines gained their nationwide fame. By keenly identifying the needs of consumers in every era and boldly shifting its flagship products, Shigaraki ware has consistently remained an integral part of people's lives.

The "Keshiki" Born from Chance ── Deciphering the Beauty of Shigaraki Ware

The allure of Shigaraki ware is said to lie in its unpredictable "keshiki" (scenery), which emerges from the interplay between an artisan's intent and the natural forces of fire and clay. Here, we'll explore some of its most iconic features. While we'll get into some technical terms, understanding them will bring the unique character of each piece to life.

First is the "yakishime" technique, a hallmark of Shigaraki ware that involves firing clay at high temperatures without applying glaze (yuyaku, a glassy overglaze). It is during this yakishime process that a variety of beautiful "keshiki" are born.

One is "hiiro" (fire color). This is a delicate scarlet or rusty-orange blush that appears on the vessel's surface during "sanka shosei" (oxidation firing), when iron in the clay reacts with oxygen inside the kiln. This color, which evokes the warmth of skin, is a highly treasured form of keshiki because it stands out beautifully against Shigaraki's white clay body.

A second is "shizen-yu" (natural glaze), also called "biidoro-yu" (vidro glaze) for its glass-like appearance. This phenomenon occurs when ash from the burning firewood drifts onto the pieces during firing, melts at temperatures over 1200°C, and chemically reacts with the clay's components to naturally form a green or tan glassy layer. This is not a man-made pattern but an accidental creation of the flames, ensuring that no two pieces are ever identical. This is where the magic of Shigaraki ware truly shines—born from the forces of nature that transcend human intention.

A third feature is "ishihaze" (stone bursts). The clay used in Shigaraki is intentionally left unrefined, keeping coarse grains of minerals like feldspar to preserve the clay's raw power. Ishihaze occurs when these embedded stones pop out on the surface or create small fissures around them as the clay shrinks during firing. This is not seen as a flaw but as a cherished design feature that showcases the raw, untamed character of the clay, highlighting the natural beauty of Shigaraki's earth.

These "keshiki" are not something an artisan can fully control. Instead, an artisan's skill and artistic intuition are truly tested by how they embrace these chance occurrences, channeling them to elevate a piece into a unique work of art.