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Hot water coolers, or <em>yuzamashi</em>, are essential components of <em>sencha</em> tea sets. <em>Yuzamashi</em> are used to cool boiled water to the ideal temperature for the type of tea to be brewed. The kidney-like shape of this one permits it to be cradled in one hand, following curvature of the palm, with the tips of the thumb and index finger each pressed against a <em>nyoi</em> staff-head-shaped applied form, perfectly placed to ensure a stable hold. Someone pinching the cooler in this way would have enough protection from the heat to maintain a steady grip but also sufficient contact along the base of thumb to assess the water temperature. <br><br>On each of the cooler’s two longer sides, a pine tree in grass or sand is painted under the glaze in cobalt blue. The tree on one side has two main roots and two large branches, while that on the other has a single, thick, curved line from root to tip with racks of needles spreading across the width of the sky. A blue oval is traced along the footring, and the center of the base contains an ovoid “Seifu” seal.