This is such a simple application and solution to natural daylighting and avoiding the use of any energy at all, plus it recycles plastic bottles.
http://cleantechnica.com/2011/08/01/solar-lights-made-of-plastic-bottles-water/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+IM-cleantechnica+%28CleanTechnica%29
Thursday, August 4, 2011
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