The characteristic of glass, that makes it so different from any other material, like metals for instance, is the way in which is solidifies, by which we mean the way it goes from the high temperature, liquid state (about 1580°C for glazing glass) to the rigid-solid state: solidification occurs slowly and gradually as the temperature drops, going from the fluidity of the melted liquid, due to subsequent viscosity increases, to the rigidity of the solid at a temperature of around 500°C. While it is solidifying, between a temperature of about 1100°C (a doughy liquid state) and 500°C (rigid-solid state) the glass can be worked and modelled to make an object, a sheet that will be rigid like a solid element but seemingly liquid because of its transparency.

Sacilese then cuts, shapes, finishes the edges, drills, curves and lastly tempers these "annealed" sheets.