What exactly are quasicrystals, often called the “third state of matter”? Professor Keiichi Edagawa of #UTokyo_IIS has been a pioneering figure in the field of quasicrystal research since its early days. This article explores his groundbreaking work—such as capturing the once-enigmatic formation process of quasicrystals on video—and delves into the unique nature of this mysterious structure.