Koshiro Onchi was a pivotal figure in the development of modernist printmaking in Japan, particularly known for his contributions to the Sosaku Hanga movement, which emphasized the artist's involvement in every step of the printmaking process, from design to carving to printing. Onchi was born in Tokyo, Japan, into an artistic family; his father was a professor of calligraphy, and from an early age, Onchi was exposed to a wide range of artistic disciplines. This diverse artistic environment nurtured his eclectic interests, which ranged from music to literature, and significantly influenced his later work as a printmaker and book designer. Onchi's artistic career began in earnest after his studies at the Tokyo School of Fine Arts, where he initially focused on Western-style painting. However, his interests shifted towards printmaking, inspired by the potential of expressing modern themes through traditional Japanese techniques. He became a leading figure in the Sosaku Hanga movement, advocating for the artist's complete control over the creative process, a departure from the collaborative approach traditionally seen in Japanese woodblock printing. Onchi's work is characterized by its abstract compositions, innovative use of color, and the integration of textural effects, which often sought to evoke emotional and lyrical qualities. Throughout his life, Onchi remained deeply involved in the intellectual and artistic communities in Japan, contributing to various magazines and collaborating with poets and writers, creating visually expressive accompaniments to literary works. His work played a crucial role in redefining Japanese printmaking in the 20th century, moving it away from its historical focus on depicting the external world to exploring more introspective and abstract themes. Onchi passed away in 1955, but his legacy lives on through his influential prints, which continue to inspire artists and collectors worldwide. His contributions to the Sosaku Hanga movement have cemented his place as a key figure in the history of modern Japanese art.