A brushstroke that captures summer ritual.

There is a moment in the Japanese tea ceremony when the season itself becomes part of the ritual. In summer, the bowl changes. It opens, wider, shallower, closer to flat.

The hira-chawan (平茶碗) was born from this understanding: that heat should be allowed to leave, that matcha should breathe, that the act of drinking in summer deserves its own vessel.

This one is made of glass.

— The Hand Behind the Painting —

Kato Eizan (加藤永山) trained under two masters of the Kyoto ceramic tradition before turning to glass as his　medium. Each bowl he produces is painted entirely by hand, one at a time, never repeated. The clematis flowers you see here, two blooms in white and pale blue, their leaves rendered in varying depths of colour -exist on this bowl alone.

No two are the same. No second one was made.

The clematis (鉄線, tessen) has been a motif of the Japanese summer for centuries: a climbing flower that blooms quietly, without urgency, on its own terms. It was chosen here not for decoration, but for meaning.

— Light Through Glass —

Where ceramic holds and conceals, glass reveals. As you turn this bowl in your hands, the hand-painted clematis shifts – white becoming luminous, blue becoming water, the colours alive in a way that only transparency allows.

Fill it with matcha and watch the vibrant green settle against the painted flowers beneath. It is the most visual
way to experience the ritual.

The bowl is made from heat-resistant glass, designed to hold hot matcha without compromise a bridge between the classical form and a modern sensitivity to material.

— The Wide Mouth of Summer —

The generous mouth of the hira-chawan invites the whisk to move freely. The matcha cools just enough. The hands feel the lightness of glass rather than the weight of clay. It is the same ritual and entirely different.

To hold this bowl in summer is to understand why the season has its own chawan. Not because the tea changes, but because the way we slow down does.

This piece comes in its original box. Painted by hand, one stroke at a time, one bowl only.
It will not be made again.