Japan is one of the world's top consumers of cardboard. The cardboard beds used during the Tokyo 2020 Olympic and Paralympic Games captured global attention. That was just one example of the many innovative ways in which Japan has made use of this humble material. Our guest, university professor Saito Katsuhiko, introduces some new products, and comments on the cultural aspects of cardboard in Japanese life. In Plus One, Matt Alt learns how to make cardboard artwork from a master of the craft.