5.7.8

"The triangle represents the generation of energy and initiative; it is the most stable physical posture. The circle symbolises unification, serenity and perfection; it is the source of unlimited techniques. The square stands for form and solidity, the basis of applied control."

"When the triangle, the circle and the square become one, it moves in spherical rotation together with the flow of ki, and the Aikido of sumi kiri ("total clarity of mind and body") appears."

- Morihei Ueshiba O'Sensei