There are lots of different art pieces in oriental art (painting, sculpture, pottery, etc.). The main countries in this art expressions are China & Japan.
Traditional Japanese art forms have been a source of fascination and inspiration for centuries, not only in Japan but internationally. This is partly because, among other things, their uncomplicated beauty can be appreciated by almost anyone.
As seen in the wikipedia: Ensō circle symbolizes absolute enlightenment, strength, elegance, the universe, and mu (the void). It is characterised by a minimalism born of Japanese aesthetics.
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.
More info about Japanese Art in the Britannica Encyclopaedia.
As seen in New World Encyclopedia: «Chinese art traditions are the oldest continuous art traditions in the world. Early so-called «stone age art» in China, consisting mostly of simple pottery and sculptures, dates back to 10,000 B.C.E.»