In recent years, while the development of technology has made comfortable living possible, it has also had an adverse impact on the environment and we are under pressure to shift to a more sustainable society. The "ERATO Kawahara Universal Information Network Project," led by Professor Yoshihiro Kawahara of the University of Tokyo’s Graduate School of Engineering, is attempting to build basic technologies and realize the ideas required for next-generation devices. Dr. Kawahara and his team are attempting to create novel possibilities for coexistence using environmentally friendly ‘Goldilocks’ tools that are just right in terms of design and performance for users.