Linda Heenan wrote:
Well, I have enough trouble telling left from right, without adding another four compass points. I would just never know which direction it was. The numbers work because they go around in order and I can use them from any direction.

I seem to be having trouble with numbers - they are too vague and give no indication for which is left and which is right.
Compass directions are much simpler for me when used just as relative direction indicators - the "North" in the directions might simply mean as the initial starting direction, south would then point in the opposite direction and east/west would be left/right respectively. No need to tie them directly to the geographical directions...
Linda Heenan wrote:I don't think it matters which sort of directions we use as long as they work for the students. In my opinion teachers and students should wear the same pants and shirts with different colours on the legs and sleeves, so students know which leg or arm is moving

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shure .. and make things even more difficult by color coding every movement, step and position...
In my experience, the movement of ones body and limb follows the intention of the movement and directions and hand/foot positions are all important only for a very short period while you are just memorizing the choreography of the form movements.
But in order to learn better you will sooner or later have to start looking at the movements as a whole, not as a disjoint set of ever changing limb and body positions...
To paraphrase the Scott Laoshi - "You don't have two hands, two feet, waist, head and shoulders - you have ONE body". This one body is one as a whole, not a sum of its parts...