I just wanted to share this video of a teaching method I came up with. If there's any interest in fan forms later on I can post a video of the Flying Rainbow Tai Chi Fan form which includes moves from Yang, Chen and Sun style.
Anyways, this move (turn body with wrist techniques) is one of the most technically demanding moves for beginners in this form. So I invented a square form for it and long story short it worked and the students were able to get the move down almost 100%.
I got the idea from the Wu style because they have a square form, and Sun style can also be taught this way. I have also seen some movements in Chen style taught in this manner. I am exploring the principle in greater detail and I think it may lead to some interesting results later.