Core glass, glass one of the molding method of instrument. Mesopotamia in BC is to start in about 1600, and was lost along with the invention of glass blowing technique to 1 century BC. The finish to create a (nuclear) core refractory clay ahead of the metal rod, cooled gradually shaped covered with glass was dissolved, scraped the core in. Possible hard to express with the glass or the like blowing, even delicate three-dimensional representation.
Core glass artist, Sato Toru and his works