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. Modern cardboard can be insect-repellent, waterproof or strong enough to carry a piano. It's also used in emergency goods such as rooms and toilets. In fact, people in Japan use roughly 150 new cardboard boxes a year. In a 5-minute digest, we examine a broad range of cardboard products.