Why Does Hagi Ware Have a Notched Base? Understanding the ‘Kiri-kodai’ Craft

When first encountering a handcrafted Hagi tea bowl, many tea enthusiasts notice a deliberate notch carved into the base and wonder: “Is this a flaw?” In the world of Japanese ceramics, this intentional gap is known as Kiri-kodai (cut base). Far from being a manufacturing defect, it is a hallmark of Hagi ware that blends historical necessity with pragmatic design and deep aesthetic philosophy.

The Three Origins of the Kiri-kodai Notch

To understand the charm of the Hagi notch, we must look back to the Edo period. Kiri-kodai was not merely a stylistic choice; it was a clever solution to social, physical, and aesthetic challenges.

1. A Marker of Social Status

During the Edo period, Hagi kilns were patronized by the Mori clan. Tea bowls created for feudal lords were expected to have perfect, unbroken circular bases to symbolize dignity and perfection. To sell their wares to commoners without violating strict social hierarchies, potters would intentionally cut a notch into the base. This small flaw signaled that the piece was “imperfect” and thus permissible for non-aristocratic use.

2. Technical and Practical Utility

From a technical standpoint, Hagi clay is coarse and porous. When firing in high-heat kilns, these thick bases are prone to cracking due to uneven thermal expansion. The notch acts as a “breathing port,” allowing heat to circulate and reducing the risk of stress fractures during the firing process. Furthermore, because Hagi ware is highly absorbent, the notch provides essential drainage and ventilation after washing, preventing mold and ensuring the longevity of the vessel.

3. The Aesthetics of ‘Wabi-sabi’

Deeply influenced by the tea master Sen no Rikyū, wabi-sabi celebrates the beauty of imperfection and asymmetry. The Kiri-kodai notch breaks the monotony of a perfect circle, giving the tea bowl a unique personality. For the seasoned tea practitioner, this notch is not a defect—it is a keshiki (scenery), a detail meant to be observed and appreciated during the tea ceremony.

Common Styles of Kiri-kodai

Not all notches are created equal. Potters adapt the design based on the bowl’s shape and clay composition:

Style	Description	Effect
Ichimonji-kiri (Single cut)	A single, straight cut like the character ‘一’.	Minimalist and classic; provides a tactile grip point.
Jumonji-kiri (Cross cut)	Notches on opposite sides or four directions.	Optimal for drainage and stability in larger bowls.
Wari-kodai (Split base)	Deep cuts that split the base into two or three parts.	A bold, rustic look ideal for wabi-style tea gatherings.
Sakura-kodai (Cherry blossom)	Intricate cuts curved to resemble petals.	Decorative and poetic; a refined touch of craftsmanship.

Practical Care and Maintenance

Because of its porous nature, Hagi ware is famous for Hagi no Nanabake (the seven transformations), where the bowl absorbs tea over time, deepening in color. To properly maintain your bowl:

• Preparation: Soak a new bowl in clean water for 30 minutes, or gently simmer it in rice water for 10–15 minutes. This fills the microscopic pores and prevents leaks.
• Cleaning: Never use detergent, as the porous clay will absorb the chemicals. Use warm water and a soft cloth.
• Attention to the Notch: Use a soft brush to ensure the Kiri-kodai area is free of tea residue.
• Drying: Ensure the bowl is completely dry before storing. Turn it upside down or on its side to allow air to pass through the notch.

Frequently Asked Questions

Will the notch scratch my table?

Most master potters smooth the edges of the notch before shipping. If you feel any sharp grains, you can use very fine-grit sandpaper (1000+) to gently polish the area, or simply use a bamboo tea mat.

Does every Hagi bowl have a notch?

No. While it is a signature feature, it is not a requirement for a piece to be considered genuine Hagi ware. Look for the characteristic glaze, clay texture, and “crackle” (kannyu) patterns.

What should I do if my bowl leaks?

If a new bowl leaks, it is not defective. Simply continue to use it; the tea components will naturally fill the pores over time, making the bowl increasingly watertight and beautiful.