Tea ceremony fresh water jar of blown two-color cased glass.

Blown glass

Blown glass (fukigarasu) is made by applying a gob of molten glass to the end of a stainless-steel tube called a blowpipe. Air is then blown into the tube, inflating the gob like a balloon and making it possible to manipulate the glass into various forms. The finished glass is placed in an annealing furnace and slowly cooled.