I am thinking only of those movements caused by organisms moving themselves. From basic tropisms (the heliotropism of the sunflower staring always into the sun) to complex human techniques. I am not thinking of the buffeting kinds of movement that is our constant background: unfelt jiggety brownian movement; wafting of motes of pollen and seeds; stong flowings of winds and tides; bashing, dashing (along with all your hopes) sweeping away. I have not had the time (nor courage?) to trace out the connection of these two types of movement.
The salient movement is further divided (mostly when speaking of human sorts of people but it's just as relevant to many other kinds of people as well) into instrinsic movements and extrensic movements. I will for now restrict myself to the extrensic, the movement of the person within a field. Clearly there is a kind of boundary here, a shielding of an inside against an outside. The boundary interspace is crucial for the entangling, in ever-smaller fractal increments, of intrinsic and extrinsic.
Extrinsic movement is always bidirectional. Recall the story of the lab monkey. more to come
The bidirectionality of movement is related to reciprocity. Is reciprocity the larger law?