Glass refines the stone, providing it with radiance and shine, permitting light to shine through the thick and forever dark crystals of its matter. Glass injects light into its bowels, letting it grow from a rock and catch light in its lap.
The stone supports glass, puts it into a sunny spot and lets it play with light rays. The stone is an old man who does not show off. It laughs up its sleeve over the frivolity of glass.