Ocean Wave Hexagons, Mulberry paper (kozo washi) treated with fermented persimmon tannin (kakishibu), and silk threads (itoire), Ocean wave (seikaiha) hexagons (kikko) form this geometric motif. During the feudal period, samurai would wear armor constructed with plates inspired by tortoise shells. In Japan, ocean wave symbolizes strength and the ebbs and flow of water and life., Japan, mid 18th - early 19th century, textile designs, Katagami, Katagami