I think it would be incredibly cool to have half a dozen of these things lined up on the railing of my deck. These "Sun Jars" are just a a traditional Mason jar with a highly efficient solar cell, rechargeable battery and low energy LED lamp inside. When the jar is placed in sunlight the solar cell creates an electrical current that charges the battery over a few hours. This energy is then used at night to power the three LED lamps inside the jar. Pretty damn cool. Probably cause cancer or something horrible though.