Zen calligraphy is viewed as depicting ‘pictures of the Mind’ and your degree of enlightenment is seen expressed in the flow of the ink. The renowned calligrapher Sengai (1750–1837) produced a vast number of works. Perhaps the most famous Zen painting in the world, comprising only a square, triangle and circle, he saw as the embodiment of the Universe. The 3 forms overlap a little, suggesting their interconnectivity.
Ueshiba Morihei (founder of aikido):
“The body should be triangular, the mind circular. The triangle represents the generation of energy and is the most stable physical posture. The circle symbolizes serenity and perfection, the source of unlimited techniques. The square stands for solidity, the basis of applied control.”
Here is my version of these timeless concepts: