Groping around to find your way in the dark is definitely not something fun, but here's a concept that might just turn things around. The Light Handrail concept will utilize e-paper displays that have been specially lined up at appropriate distances, allowing one to show off advertisements, movie trailers or even emergency information as and when the situation calls for it. Would be cool if these displays came with some sort of photovoltaic material underneath it to absorb the sun's rays during the day for a more eco-friendly approach.