Lampworking
From Fritipedia
Lampworking is the process of using a gas torch or 'lamp' to make objects out of glass.
How is it done
Glass rods are heated to melting point and wound onto mandrels that have been dipped into bead release. There is also a subcategory of lampworking that is referred to as "off mandrel". Sculptural glass pieces and marbles can be made in this way. Glass is heated using propane and a torch or with a duel fuel torch which uses propane and oxygen from either a tank or an oxyconfor instance a minor.