Inspired by the Japanese government, my project proposes a new framework for communication using materiality as a tool to encourage discussion between government and citizens. As demonstrated by the pandemic and politics, communication between the public sector—including national and local governments—and citizens often does not function well. One of the reasons is that relationships between stakeholders are not clearly recognized. To manage this problem, I propose showing the relationships between stakeholders and their communication patterns in three dimensions using materials such as clay, plastic balls, and yarn. I also created a game in which three-dimensional objects and cards enable people to assess stakeholders' conditions and to think of new means of communication. This work is one of the branches of Designing Meaningful Communication in Public Decision-Making (a co-design series created with Jinyi Li, Transdisciplinary Design ’21).