The height of Rikyū’s take futa-oki, 竹蓋置, bamboo lid-rest, measures 1.8 sun kane-jaku, 1.8 寸曲尺, “inch” bend-span: also 18 bu (分) kane-jaku, 180 rin (厘)kane-jaku. The 1.8 sun kane-jaku measurement equals 1.44 sun kujira-jaku.  Ideally, the bamboo lidrest is made of freshly cut green bamboo: ao-dake, 青竹, green-bamboo, hiki-kiri, 引切, draw-cut (sawn), futa-oki. Is the origin of the aodake futaoki a sakazuki made of aodake, and perhaps for drinking o-mi-ki , お神酒, hon.-sacred sake, at a Shintō ritual? The green bamboo cup at the right, ao-dake sakazuki, 青竹盃, green-bamboo sake cup, h. 2” – 1.7 sun kane-jaku. The height of the green bamboo futaoki used by Take-no...