Techniques used in creating the Sound Sculpture include hot glass techniques, and enhanced robust stained glass construction techniques. Xaver Wilhelmy keeps saying "it's really quite simple" but the truth is... it isn't really simple at all. Building a pipe organ pipe from glass is extremely precise business. Glass likes to break along it's own fissure lines, and it isn't the easiest thing to remove a milometer of glass where needed. But it can be done, and has been done by Xaver Wilhelmy and his crew at www.Geshenke.com.