Cast Glass Sculptors employ the "lost wax" method of casting whereby a wax form of the piece is made first. Next, a refractory mold is made by gradually building up layers of silica and plaster on the wax with an opening through which the wax is steamed out. The mold is placed in a kiln with the raw glass above, which is programmed for a series of varying temperatures and holding times for up to a week or more, depending on the size and shape of the work. After removal from the kiln, the mold is carefully removed from the glass in successive layers. Then, power tools are used to cut and grind off the imperfections and make the construction.  These are followed by diamond tools and finishing techniques to finish and polish the work.  These labor intensive works are heirloom quality and will last indefinitely in a safe environment.