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When you travel in France, you soon notice the country has a mix of creative and practical LED lighting projects. They range from a water light graffiti wall to an office building lit exclusively by LED light bulbs. The LED water wall Poitiers in west central France is host to an innovative artwork: an interactive water light graffiti wall. The technology behind the wall is an LED lighting system. When you apply a water pistol, wet brush, damp sponge or wet finger to the wall …