Obi Sumi

Belt Sumi. A shape of Sumi that is thin, long and square like an Obi (belt). Several Sumi patches usually connect to create the pattern. Used mainly to describe the Sumi in Taisho Sanshoku. The pattern must cross the backbone and look like an Obi. It would be perpendicular to Tate sumi.

(Courtesy of the excellent Book Kokugyo Vol II)