The source of the name “YORU UMI O WATARU” refers to the phase from a classical Chinese poem. The piece is made by using a hand-forming technique, which is the traditional style of Raku ware. It is uniformly coated with a black glaze and some points are scraped off it to create a tasteful scenery. It looks as if the moonlight peeks out between clouds. Inside the large, trimmed foot of the piece, the ‘RAKU’ mark of Kichizaemon XV is impressed. The work is one of the “Ha no SHU” series.