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This method held a pre-eminent position in glass forming ever since its introduction in the middle of the 1st century BC until the late 19th century, and is still widely used as a glass forming technique, especially for artistic purposes. The process of free-blowing involves the blowing of short puffs of air into a molten portion of glass called a "gather" which has been spooled at one end of the blowpipe. This has the effect of forming an elastic skin on the interior of the glass blob that matches the exterior skin caused by the removal of heat

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