Glass and Glassmaking

Ways of shaping glass and the glasses imagined to be tougher than ordinary glass, from glassblowing, which inflates molten glass into a bubble with a blowpipe, to unbreakable glass, which does not show the normal fragility of glass, and flexible glass, an alleged lost invention of Roman times. An invention belongs here when the cited article describes it as a glassmaking technique or a kind of glass.