used in the Japanese tea ceremony. The most orthodox style is the formal , finished in highly polished black lacquer. The lower board rests on the tatami, and there are four posts at the corners of this, supporting a shelf. The width of this unit, from side to side, is equal to the width of a (Kyoto-size) tatami. A is a wooden board, usually lacquered, on which the main tea implements may be displayed in the tea room. The size derives from the size of the lower board of a . is the term for the various kinds of boards on which the portable brazier () may be arranged in the tea room. They are classified by shape as large, half-size, small, or round. They are wooden, and may be finished with lacquer and/or decorated in various other manners. There are rules for what kind of board to use with what kind of brazier. , literally "shelf/shelves," is a generic term for various types of shelving used in the tea ceremonies and placed on the host's mat. Each type of has its own name. The three basic categories are built-in (), suspended (), and portable shelves (). The latter, , are basically categorized as either large shelf units () or small shelf units (). are made of various types of wood, the most formal style finished in highly polished black lacquer. Some include drawers or shelves enclosed by sliding doors. Tea utensils may be placed onto/into the before the start of a ceremony and/or at the end. are used only tea rooms of 4.5 tatami mats or larger. Hearths are relatively small portable braziers used to heat the kind of iron hot-water kettle called , which has a spout and handle across the top. are portable braziers used in the tea room to heat the hot water kettle () to make the tea. They are commonly made of ceramic or metal, although there are rare examples of wooden as well. are fire pits built into the floor of tea rooms and used in the cold season, for heating the hot water kettle () to make the tea. The frame that fits around it at the top is called , and usually is of lacquered wood. In the season when the is not in use, the frame is removed and the is covered with one of the tatami mats that form