In glassworking, "flashed glass" is a specific technique by which color is not simply added to the batch, but is created by layering, "thus opening almost unlimited possibilities of variation." As a result, the glass "allows light to shine through but prevents inquisitive eyes from invading people's privacy."
In writing, flash pieces (short works of fiction, micro essays, or prose poems) offer a similar effect. Through extremely brief storytelling, truth can shine through while still leaving much to the reader's imagination. In both cases, the creation of the flash "requires deliberate control, experience and craftsmanship" on the part of the glassblower and of the writer.