Vessels made of earth, coated with a glaze and baked are ceramics and are not permeable by light. Meanwhile, porcelain are very hard and are permeable by light. These ceramics and porcelain are all generally called Tojiki in japanese. Japanese Tojiki are not only for practical use but are often works appreciated for their high art. In the art of flower arrangement (Kado) and the tea ceremony(Sado), the very appreciation of the flower vases and tea cups as vessels for their own sake is regarded as important; those arts, therefore, were connected all the more to the development of Tojiki. Tojiki are also referred to as Setomono, a term taken from Seto city in Aichi prefecture, a well-known production site. Representative ceramics are Shigaraki ware from Shiga and Bizen ware from Okayama; among porcelains, Imari ware from Saga prefecture and Kutani ware from Ishikawa are very famous.
There are many ceramics producing areas in Japan. Those histories are very old and traditional skills have been taken over while changing their shapes according to times. Currently there are six kilns of Japanese ancient ceramic kilns that have been in production for more than 900 years since the Middle Ages. We call the six kilns "Japan Six Old Kilns". Specifically, these are Shigaraki,Bizen, Tanba, Echizen, Seto and Tokoname. They are clearly distinguishable from the kilns such as Hagi, Karatsu, Arita, Takatori, Satsuma made from ceramics technology came from Korea and China after the early modern era.
Here are some videos explaing about typical Yakimono.
These are videos of NHK World TV that JAPANmania registered on YouTube.
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