方中带圆，圆中有方

Another phrase that came into mind recently. "方中带圆，圆中有方", translated, it means "circles within straight lines, straight lines inside circles".

For example, even when pushing in a straight line, your hand spirals out, thus it is circles within a straight line. And when you use a circle to neutralise your opponent's force, looked at from the side, it is actually a straight line.

But looking it at an even higher level, there are circles within circles. For example, when neutralising your opponent's force with a circle (which is a straight line when viewed from the side), if you add in spirals within the circle, your circle will have a straight line that contains even more circles (spiral).

And thus taiji is all about circles.

Now to get down to really understanding and applying this...