Sangen: IMHO, the triangle trinity of mind-body-spirit, past-present-future represents fire and water, Ki flow, and a stable posture. The circle is universal for infinity, eternity, serenity, and perfection, fluid without beginning or end. The square is stability, order and applied control. Together triangle (man), square (earth), and circle (heaven). Enter with the sharp point of the triangle, move and flow like the circle, and hold with the firmness of the square.