I distinguish three fundamental sets of Taiji principles:

• Principles of Station: sink & relax; upright spine;
• Principles of Motion: single-weightedness; turning the waist;
• Principle of Continuity: keeping the mind on the job, also called Mind Continuous or the Principle of Flow.

Mind Continuous is the space in which the first two sets of principles (the physical principles) operate. It allows them to work together and regulate each other, each creating, preserving, and negating the others.