Suminagashi (墨 流 し) or "floating ink" is the process of mixing water and ink to marble plain rice paper, transforming it into something vibrant and colorful. It originated in Japan as early as the 12th century.

The act of creating the patterns on water captures any vibrations and air movements in the environment. The creator's bodily acts of breathing, conversation, and physical movement will affect the outcome of the piece. As a result, every piece of Suminagashi captures the unique essence of the environment and the creator together at that specific moment in time.