Also ichijū tsuridana 一重釣棚. A single shelf suspended by a slender bamboo pole. It is made of paulownia when it is hung in the tea ceremony room *chashitsu 茶室 or cedar when hung in the kitchen *mizuya 水屋. According to the *Chadōsentei 茶道筌諦(1848), it was devised by Sen no Rikyū 千利休 (1522-91) and became the basis of all the hanging shelves used in the tea ceremony room. It is believed that the size of this shelf was determined by a system of measurement called kanewari 曲割 and based on the size of the portable display shelves *daisu 台子. The standard size was 31 cm long x 26 cm wide. Besides the bamboo pole, small wooden clamps of mulberry were added to attach it to the wall. The Rikyū chadōguzue 利休茶道具図会 (1701) states that the height of the shelf from the mat to underneath the board was about 82 cm. The depth was about 26 cm, the width about 32 cm, the thickness of the board 1.2 cm and the clamps 1.4 cm. The bamboo pole was placed at the front corner. Ichijū dana was generally used in small simple, rustic style rooms, principally the two mat, nijō 二畳, size.
When a single hanging shelf is used in a small kitchen, mizuya, it is extended to 35-36 cm long. If the tea ceremony room is arranged with the firebox placed inside the host's mat *temaedatami 点前畳, the shelf is constructed along the right inner edge of the furnace *mukōgiri 向切. If a middle post *nakabashira 中柱 is included in the room, the shelf is hung toward the guest's mat *kyaku datami 客畳. Lacking the middle post the shelf may be hung in the kitchen. When the shelf is hung in the tea ceremony room, its position must be within easy reach of the host because it is used for arranging the tea utensils. Examples: Myōkian Taian 妙喜庵待庵, Saiōin, Yodomi no seki 西翁院淀看の席 both in Kyoto; Kanden'an 菅田庵 in Shimane Prefecture.
