Drawing ensō is a disciplined-creative practice of Japanese ink painting—sumi-e (墨絵 "ink painting"?). The tools and mechanics of drawing the ensō are the same as those used in traditional Japanese calligraphy: One uses a brush (筆 fude?) to apply ink to washi (a thin Japanese paper).
The circle may be open or closed. In the former case the circle is incomplete, allowing for movement and development as well as the perfection of all things. Zen practitioners relate the idea to wabi-sabi, the beauty of imperfection. When the circle is closed, it represents perfection, akin to Plato's perfect form (Plato), the reason why the circle was used for centuries in the construction of cosmological models, see Ptolemy.
Usually a person draws the ensō in one fluid, expressive stroke. When drawn according to the sōsho (草書?) style of Japanese calligraphy, the brushstroke is especially swift. Once the ensō is drawn, one does not change it. It evidences the character of its creator and the context of its creation in a brief, contiguous period of time. Drawing ensō is a spiritual practice that one might perform as often as once per day.
This spiritual practice of drawing ensō or writing Japanese calligraphy for self-realization is called hitsuzendō (筆禅道 "way of the brush"?). Ensō exemplifies the various dimensions of the Japanese wabi-sabi perspective and aesthetic: Fukinsei (asymmetry, irregularity), kanso (simplicity), koko (basic; weathered), shizen (without pretense; natural), yugen (subtly profound grace), datsuzoku (freedom), and seijaku (tranquility).
Use outside of Zen Buddhism
In 1995, Lucent Technologies hired the San Francisco office of Landor Associates, a transnational brand consultancy, to design their brand image. In the design of the logo, Landor colored an image of an ensō red. The designer intended the brushstroke to imply human creativity, and the red to convey urgency. They named it the "Innovation Ring". "Our name and symbol represent the new entrepreneurial spirit and vision of our company" reads a public relations statement from Lucent. In North America, the logo was widely misunderstood. After years of staying-power and familiarity, the logo became more accepted by industry people in the West (including Lucent's own employees), although it was still not well understood. Nonetheless, soon other logo designers began to be influenced by the work. Lucent stopped using the logo after merging with Alcatel of France to form Alcatel-Lucent.
A variation of the symbol was also used as a logo by Obaku Ltd.. They continue to use an ensō shape as a wristwatch brand.
Thinking, an international design and consulting house centred in London, uses an ensō  meaning "Expression" as one of their four icons, along with icons for science, pattern and vision.
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- Abstract expressionism, a 20th-century American art movement
- Buddhism in Japan
- Dhyāna in Buddhism, a meditation practice in which the observer detaches from several qualities of the mind
- Ink wash painting, an East Asian style of brush painting that uses black ink
- Ouroboros, an ancient symbol depicting a serpent or dragon eating its own tail
- 17th-century Rinzai master Bankei Yōtaku occasionally used two brushstrokes.
- Seo, Audrey Yoshiko (2007). Ensō: Zen Circles of Enlightenment. Boston: Weatherhill. ISBN 9780834805750. OCLC 71329980.
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