Master glassblower and stained glass artist Loren Stump in California has wowed the internet with an extraordinary display of virtuosity. He created a “loaf” of glass, called murrine, out of carefully layered glass rods that, when sliced, reveal a painstakingly detailed work of art in cross-section. His greatest work is called “Madonna of the Rocks,” but all of his murrini are incredible works of art and craftsmanship.