I came upon this picture from Chen Xin book 陈氏太极拳图说 Illustrated Canon of Chen Taijiquan. It strikes me that the spiral lines is drawn carefully to go through the major joints.
Spiral is the structure that allow to return incoming force outward, think of drill bits that extract material upward as it drill inward. Master Chen also explain the spiral mechanic in this video
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Hi. There is a bit of debate amongst some friends of mine as to whether this video shows an example of using “dual opposing spirals”. Is that a term you use in your practice?