During its execution, the stroke can be energetic and fast, or on the contrary it can happen in a calm and smooth way, but in both cases it will be a brushstroke without hesitation, a vehicle of action of an experience internalized during meditation and from which a full form of vital energy will emerge. The circle can be drawn leaving an opening or sealing its entire form. An example of this last case is the work of Sengai Gibon 仙厓義梵 (18th century), where an irregular enso can be observed as a result of the uneven expansion of ink during its path. As a result, one can observe a wider and more pictorial area and another (the lower area) more linear and graphic, the latter as a result of the exhaustion of the ink… The symbol, in this case, is accompanied by a calligraphy in sosho style 草書 (cursive writing or “grass writing”), a Buddhist phrase popularly spread in Japan. It is very common in these creations for the circle to dialogue with poems, phrases or questions about the practice of meditation or questions inherent to nature and the universe. On the contrary, in the case of the circle made by the Zen master Yamada Mumon 山田無文 (20th century), the brushstroke does not join the beginning and the end of the stroke, but leaves a small opening that indicates that it is not something contained in itself, but rather opens to space, to infinity, incorporating complete harmony. The opening can mean that it is part of something larger, or that imperfection is an essential aspect of existence. In this case, it is followed by a koan 公案, a type of question very typical of the Zen tradition, which the master usually asks his disciples and which is aimed at detaching themselves from rational thought and increasing their level of consciousness to progress in their learning. The translation of this phrase, also written in sosho style: “What is it?”, connects directly with the reflection on the circular form.
From a strictly Buddhist perspective, the circle symbolizes an overcoming of duality: the unity of phenomena expressed through a single, rapid, spontaneous gesture that characterizes Eastern painting.