Dot in space
Master Chen Zhonghua has demonstrated numerous times of having a fixed point (dot) for rotation in his action. Recently, I start to understand the pair of contacting points which can be used to create a stick/lever. I have been able to rotate an opponent using a dot in the middle of the stick. Today, I realize this dot can, in fact, be in space, and not necessarily in the opponent's body. It depends on how I contact the opponent, e.g. which body parts I use to create the stick. This kind of rotation is vertical, and can take the bottom support out from the opponent.
Source: https://practicalmethod.com/?p=45819