Korxx Building Blocks, from Germany, are a new twist on conventional building blocks.  Not only quiet, lightweight and eco-friendly, the cork blocks have enough natural friction to their surfaces that construction ideas are possible that would fall apart with wooden blocks.  Founders Sven and Patricia Kuch are passionate about helping parents like themselves share and learn through playing together.  Their KORXX products are fun, feel great and lend themselves to whatever kids can imagine.  They are made from sustainable, renewable cork bark (the treesre-grow the bark naturally) and are completely safe.