Sei (清) is a Japanese concept that translates to "purity" or "cleanliness." It emphasizes the importance of maintaining a clean and orderly environment, which is believed to promote mental clarity and well-being. This idea is deeply rooted in Japanese culture, influencing practices in various aspects of life, including Shinto rituals and Zen Buddhism. In daily life, sei manifests in habits such as tidying up spaces and respecting nature. The concept encourages individuals to cultivate a sense of harmony and balance, reflecting the belief that a pure environment leads to a pure mind. This principle is often seen in traditional Japanese arts, such as Ikebana and Tea Ceremony.