Shōwa Period Kumiko Ranma Milk Glass Wall Transom Decoration, Japan, 1920s

Wooden Kumiko ranma made from Japanese cypress.

The backside of this ranma features semi-transparent glass.

An authentic and traditional Japanese interior decoration.

Dimensions: height 31 cm, width 78.5 cm, depth 3 cm.

Kumiko is a traditional Japanese woodworking technique used to create intricate lattice patterns or grids, commonly found in sliding doors, room dividers (shoji), and decorative screens. Kumiko patterns are constructed by interlocking small wooden pieces without the use of nails or glue, relying entirely on precise wood joinery and craftsmanship.

The process involves cutting and assembling thin wooden strips (often made from Japanese cypress) into various geometric shapes, such as squares, diamonds, or hexagons. These pieces are then assembled to form the desired pattern, creating a visually stunning effect that diffuses light while providing privacy.

Kumiko craftsmanship requires a high level of skill, patience, and attention to detail, making it a revered art form in Japan. It has been practiced for centuries and continues to be valued for its beauty and craftsmanship in both traditional and modern architectural design.