An ensō is a circle drawn with a brush in a single stroke. It is one of the most familiar images of Zen Buddhism, and one of the simplest: black ink, white paper, one movement of the arm.
It is also, almost always, imperfect. The line thickens and thins. The brush runs dry and the ink breaks into streaks. The two ends do not quite meet. That imperfection is not a failure of the drawing. It is most of what the drawing is about.
One breath, no correction
An ensō is made in one movement, often described as one breath. There is no sketch underneath and no second pass. Once the brush leaves the paper, the circle is finished, whatever it looks like.
That is why ensō were drawn by Zen monks as a kind of practice, and why they were thought to show the state of mind of the person who drew them. A hesitant hand leaves a hesitant line. A hurried one leaves a hurried line. There is nowhere in a single stroke to hide.
Many of the best-known ensō are by Zen teachers of the Edo period, such as Hakuin and Sengai, often with a short line of calligraphy written beside the circle.
What the circle means
There is no single meaning, and Zen teachers have tended to resist giving one. The circle has been read as emptiness, as completeness, as the moon, as the universe, as the moment itself. Sometimes the inscription beside it asks the viewer a question rather than giving an answer.
The plainest reading is that it means what it shows: this circle, drawn by this hand, at this moment. It will not be drawn the same way again.
Open or closed
Some ensō are closed, with the end of the stroke running back over the beginning. Others are open, with a gap where the brush lifted before the circle was complete.
The open circle is often read as leaving room, for movement, for imperfection, for what is not yet finished. It is close in spirit to yohaku, the deliberate empty space in Japanese painting and design, and to the way a sumi-e painting leaves most of the paper untouched.
Ensō and wabi-sabi
Wabi-sabi, the Japanese way of seeing beauty in what is imperfect, impermanent and incomplete, is easy to describe and hard to show. The ensō shows it in one image. A perfect circle could be drawn with a compass. The ensō is valuable because it could not have been.
Drawing one yourself
Nothing special is needed. A brush pen or an ordinary brush, black ink, and paper that does not mind being wasted. Sit comfortably, with the paper in front of you and the arm free to move.
Breathe in, start the stroke, and move round in one movement as you breathe out. Do not stop to look. Do not go back over it.
Then draw another. And another. After a dozen, set them side by side. Some will be lopsided, some thin, some heavy at one side. The interesting thing is usually not which is best, but how differently each one came out, from the same hand, a minute apart.
Keeping one
A single ensō on a wall does what one object in a tokonoma, the alcove of a Japanese room, is meant to do: give the eye one thing to rest on. It works best alone, with space around it, somewhere it will be passed every day and noticed now and then.
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This article is part of a series exploring Japanese philosophy and intentional living: