I read “日本の手仕事をつなぐ旅 うつわ (written by久野恵一(1947-2015))” He did for Arts and Crafts Movemen (by William Morris) for pottery in Japan. He had pottery(Arts and Crafts) shop”鎌倉 もやい工藝”. The pottery in Japan had big influenced by Arts and Crafts Movemen in Japan. The Japan Folk Crafts Museum exhibit works as to Arts and Crafts Movemen in Japan.
I think the author thought good pottery had
(Of course the skill of forming and artistic quality is most important)
I think at Japanese culture the contingency and the natural is important by tradition.
I thought the cup of the pottery by Kinta (artist in mashiko) has relatively such a character (warmth, ununiformity, left-right asymmetric, simplicity).