I'll share a model using the
that has come down to my dojo as a model of the training progression.
The first stage which is concerned with acting as a wedge that is strong, stable and piercing with its sharp point.
The next in which action becomes more plastic and dynamic while still containing the triangle.
The last in which the entire space is filled and one has already mastered and controlled each situation; again containing both the circle and triangle within it.
Take it for what it's worth.