Paper has been used in many aspects of life from long ago and is indispensable for the daily lives of Japanese people. Japanese paper has excellent quality and durability and has even gathered attention from around the world and has been used for repairs in overseas museums and libraries. Further, Japan is said to have the greatest variety of paper in the world. People from around the world will be able to see a variety of Japanese papers during the Tokyo Olympics. How does Japan's paper compare to the world's? We search for cools down to paper-thin differences.