With geeks all over the world testing the supremacy of technology and pushing its frontiers, simple yet useful devices are going through a major facelift. An innovation of today becomes an object of daily use in a matter of few years. This time, it’s the turn of lighting devices. General Electric Co. has come up with a machine that can prints sheets of light. The flexible sheets are coated with a layer of OLEDs and other chemicals which run 8-inch wide with a final layer of metal foil to guard the mixture. It emits a blue-white glow on having passed electric current through it.