The recipe for making glass has changed little for several thousands of years: sand, alkali ashes, and lime from crushed stones are melted together to give a strong, yet fragile material. This molten material can then be manipulated by the glassmaker in a number of ways.This heavy stemmed wine glass from early 18th century England was free blown. This is where air is blown down a metal tube that has a blob of glass at its end creating a bubble. The bubble of glass is then shaped using a variety of tools to create the desired form.