Breathing walls. Japan's top ceramics manufacturer, Inax, has developed Eco Carat. It's a natural ceramic material with tiny holes in it that absorb moisture in the air when it's too humid and release moisture when it's too dry.
This reduces mold indoors, creating healthier air indoors. The tiles also "clean the air", absorbing nicotine and pet smells and VOC's from surrounding furniture and building materials. The tile can be used everywhere: bathrooms, bedrooms, closets. Its only limitation is that it cannot be used in areas that get completely wet, like a shower. Distributed by Stone Source here in NYC.