A Bumblebee cannot light or leave it...

  A Bumblebee cannot light or leave it...

Folks and some Tai Chi aficionados say the precision Square Form is Robotic.  Actually, "more is better" because the differentiation of localized impulses in the body is easiest to make when the stimulus is smallest. In my take on the Tai Chi Classics if I hoist a 50 lb. barbell over my head I won't feel any "differentiation" if a bumblebee lands on it.  If I am holding a piece of ribbon I would feel the "difference". The same thing when I hear, see, smell, etc.  If someone with a blaring stereo in their car pulls up next to me I can notice a change in the stimulation of that music only if they lower the volume, the change is really significant. This is a physiological law and it also applies if a stimulus is very small to start...only then can we detect small changes. As precise and robotic as they appear the movements of the square form are actually small in their own right, articulating at the joints as they do.  This stimulates the student's senses with their "smallness" and increases sensitivity to movement and that can translate into better movement in the Round Form.  In other words, Square Form is not stimulating the whole body as much Tai Chi is wont to thereby putting a lid on localized impulses which result from unbridled and for beginners most often random movement.  translated into changes in their movements. With square form, one can observe the effect the movement had on the sides of the body, neck, shoulders, pelvis, and more. One also has the opportunity to make corrections also to improve overall body structure.  Observing those changes will lead to decreased muscle tension in body, this is called the delineation of Yin and Yang, what moves and what does not move at any given time.  The effect on the brain is a reorganization of the motor cortex and tuning of the nervous system. If you take a moment to analyze the body at start and after square form, you can feel that certain portions feel weightless, one has achieved relaxation.  Again, differentiation or we say "delineation" works best with a small stimulus now we begin to see where "..when one part moves... the whole body moves..." in the Classics is merely an observation of incorrect and unhinged movement and NOT an instruction on how one should move.  After all, an infant will move an arm and the whole body will move, human beings naturally get additional neural synapses as they mature. One reaches for the coffee creamer and hopefully, their whole body does not lurch out of the chair.