The Chikuno Cube is a natural air purifier made from an ultra-fine powder of bamboo charcoal and clay minerals. Activated bamboo charcoal is a form of carbon that has been processed at a high temperature and is extremely porous. Its micro-honeycomb structure amplifies total surface area, making this small cube able to absorb odors in an enclosed space up to 17 sq. ft–ideal for refrigerators, closets and bathrooms. The Chikuno Cube won the 2008 Japanese Good Design award and is made in Kyoto, Japan.