While the nakabashira and itakabe partition the hanjo (a half sized tatami mat) used as shobanseki (seat for an accompanying guest) located beyond furosaki from teishudatami (tatami used as teishuza), by providing an arched aperture in the lower part of the wall, they also meticulously take into account how the accompanying guest will look at it.
中柱と板壁で風炉先にある相伴席の半畳を亭主畳と区切るとともに下部は丸く切り欠いて吹き通しにして相伴者の視線への配慮もぬかりない。