The black-faced danc / Tableware design

Bird Soy Sauce Jar (Vinegar Jar)
The key design is in the transparent part. Soy sauce jar symbolizes male bird, with the feature of transparent mouth in ordinary times. However, when soy sauce is
poured, it will turn into a black face. Vinegar jar, which symbolizes female bird, has seen transparent treatment at reproduction stimulating feather. Vinegar
represents the color of the said feather. Transparency makes one easy to see the level of content.