A dohyō is what a sumo ring is called, and it is a place where some of the most traditional Japenese battles have occurred over the last hundreds of years. Each ring is made built up by clay and outlined in rice straw. It is a very labor-intensive process, but the result is a stunningly precise platform for sumo bouts. This clay platform is removed after each tournament, and on occasion, guests will get to take home part of the ring in memory. The video is a little long, but feel free to skip through to see all of the interested construction processes.