Glass fusing:

Glass furnaces for bending, decorating, firing, thermofoaming of glass (fusing).

Glass fusing is a form of fused glass, which is used in glass art where pieces or strips of glass of the same or different colours are joined together by partially fusing them. Glass fusing thus also offers the possibility of blending or mixing the different colours of glass pieces with each other.

The process of bending glass, fusing, decorating but also staining, greatly affects the final result.
Along with a controlled temperature.