The sunken hearth (ro) is located between the host's seat and those of the guests, and so is used as a source of shared warmth during the colder months of the year. Come the end of Spring, however, the weather in Japan grows increasingly warm, and so the heat from the hearth is no longer welcome; the standing floor-brazier (huro) is placed as far from the guests as possible, and the (cold) water-container (mizusashi) is placed between it and the guests, as (at least) a symbol of pleasant coolness. As the heat of summer increases, various specially formed kettles and braziers may be used, in order even further to restrain the heat from the brazier.