For fifteen centuries, stained glass windows have been part of the showcasing of buildings. They have been used to tell stories and highlight events. Some images have demonstrated the beauty of geometric forms. Artists who work in this medium have new tools to assist them in the making of these beautiful windows. Centuries ago, a grozing iron was used to chip off edges of the glass to form shapes. Modern artists use steel or diamond blades to make clean cuts that break off without excess glass. The modernization of this one step has allowed artists to deliver perfect stained glass windows in less time and with more precision.