With a facade being tsuma (the gable end of a structure normally at right angle to the main ridge) provided with a kokerabuki (shingled) irimoya-style (hipped) roof, Joan has a distinctive stylishness different from that of Taian built by SEN no Rikyu.
杮（こけら）葺き入母屋風の妻を正面に向け千利休の待庵とも違った瀟洒な構え。