Taiji should be all-embracing. Each principle, cast as it is in language, must be drawn into the physical and energetic body through decades of toil. But also, the poetic and philosophic implications of each principle need to be thought and felt through to stimulate the heart-mind to reach out and touch the whole of creation. This is turning, and why turning is so important. If mind in dantien is point becoming line (vector spine) then turning is line becoming plane, a sweeping slicing plane; the whirling skirt of the dervish.