An irori is a traditional Japanese sunken hearth fired with charcoal. Used for heating the home and for cooking food, it is basically a square, stone-lined pit in the floor, equipped with an adjustable pothook – called a jizaikagi (自在鉤) and generally consisting of an iron rod within a bamboo tube. It is used for raising or lowering a suspended pot or kettle by means of an attached lever which is often decoratively designed in the shape of a fish. Historically, the irori served as the main source of residential heating and lighting, providing a place to cook, dry clothing, and act as a communal gathering location.