Murrina

Murrina is a special technique of manufacture of glass. Take the colored bars (in fact, the threads because the diameter is measured in millimeters), and one is the beam that the cut has the desired picture. Then the beam is sintered so that it turns into a sort of glass loaf or sausage. After that this loaf is enough to cut into pieces crosswise, to obtain the desired pattern. Sometimes the resulting pieces are again heated and they are allocated to different products:

The most impressive results were achieved, perhaps, Lauren stump (Loren Stump). The photo in the beginning, he created a "loaf" with the painting "virgin of the Rocks Leonardo on the cut.