Shōzui-te no zuzō ni kansuru ichi kōsatsu —— 「iro-e sansui Marubun hamagurigata hachi」 o chūshin ni 祥瑞手の図像に関する一考察——「色絵山水丸文蛤形鉢」を中心に = Study on the Images of Shonzui-de Centering on the Polychrome Overglazed Clamshell-shaped Bowl with Landscape in Circles