The transparent phone concept refuses to go away and more and more designers are producing concepts that are simply too beautiful to ignore. The transparent concept can also apply to digital cameras and other products. In fact, how can we expect to have a window that lets light in and is also a display screen that displays a curtain, a picture, a scene, or an email?
The Second Life Mobile Phone Concept, from designers Cho Sinhyung & Jeon Jungjae, goes a step further and uses the degree of transparency of its E-ink display to indicate how much battery is remaining. The more transparent the display, the less battery remaining.
source yankodesign