The word heard
This technique involves fusing pieces of glass, arranged on a base, by heating them in a controlled manner in a kiln at around 800°-850°c, until a single homogeneous piece is obtained. This firing softens the glass and deforms it when placed in an appropriate mold. Mastering this technique is essential for perfect aesthetics and reliable fusing, and there are many constraints (notably in terms of expansion coefficient, firing programs, furnace size and quality/pyrometric controls).