“the new heart,” “the bosom”: the most significant new organ in changed humans that enables controlled flight and sensory perception of nearby masses; houses an insertable lazyball inside a dense muscular envelope in the thorax, between the sternum and the backbone, close to the natural center of gravity of the human body. From a mechanical prosthetic device with a simple neural interface, motio evolved into a fully genomic organ with its own perceptual and motor areas in the cerebral cortex. A natural part of human body from birth, motio stays largely unexercised until it is seeded with a lazyball — usually in early childhood but not before walking, running, jumping are fully mastered (evolution works by appending, not replacing); some delay seeding until their teens or even further though its rarely a good idea to start in maturity because of the depth of relearning youll need. ■    Using micromotoric, largely unconscious muscle contractions, your motio invokes the balls negative inertia to induce it into acceleration — so it supports and moves your whole body; conversely, the lazyballs infinitesimal swaying sends sensory data into the brain (“gut feeling”) to form a useful, if foggy, map of your own and surrounding bodies' masses and movements. To change posture in the air, you shift and bend the body around the motio pivot (early flyers wore massive rotatable belts so as to turn around the vertical axis); at sufficient airspeed, aerodynamic steering is also used for orientation. By accelerating away from approaching masses, your lazyball provides a degree of passive collision safety (“cushioning”) — which enables active safety so long as youre conscious and, sensing your lazyballs reaction, instinctively drive it to flee or dodge the incoming mass. Large nearby masses dampen flight: no inertial coasting or quick dashes when indoors or grazing, you must work your body to keep going — effortful even when thoughtless; a related skill is dealing with the “roadside effect” of something big that passes you laterally — it can sway you off course or help you catch up with it. ■    Unfully weighted even when firmly on the ground (“gravity-squeamish,” “fastidiously lightfoot”), a lazyball carrier can walk comfortably enough in a characteristic sweeping, skating-like manner — though many make a point of emulating the classic walking gaits; you can always extract and park your lazyball when you have a lot of surface treading to do. Up in the sky, your motio drifts you without a slightest limb movement, but most people still “swim” or “wing” slightly even when flying straight — a psychophysiological universal like the arm swing in walking; in fact ones flying style is more personal than walking ever was: a lifelong flyers precise, idiosyncratic, unconscious all-body cascading — balancing, maneuvering, streamlining to speed up, navigating in encumbered spaces, playing badminton — is hard to trace, almost impossible to believably imitate.

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