This project focuses on the existence of resident microbiota, one of the most familiar symbiotic organisms to humans, and explores the ways to interact with them. ​ A large number of bacteria live on and inside the human body. While the human body has 37 trillion cells, the number of microbiota is estimated to be over 100 trillion. While they get their food and shelter from the human body, we also benefit from them. In particular, the gut microflora not only helps the digestion, but is also involved in a person's immune system, hormone production, and affects emotional expression. We are so closely interrelated that we cannot live without each other. ​ So we’ve already been interacting with each other from the day of our birth, but I want to feel more sensitively about our mutual interactions. ​ In some sake and miso breweries, it is customary to play classical music or sing traditional songs to stimulate fermentation. Inspired by this, I am trying to use sound as a means of interaction.