Ensô 

This is an Ensō, a circle drawn in one continuous line, by the Zen Buddhist monk Hakuin Ekaku (c. 1686 – c. 1769). It represents the essence of Zen, a state of enlightenment and emptiness. Ensō are often used in Japanese calligraphy and are thought to embody the Buddhist concept of Wu Wei, action without intention. The black ink contrasts sharply with the light background, emphasizing the circle’s wholeness and the artist’s mastery of brushwork.