When the two torso masses are joined, the result is a compound, torso which assumes the simplified form of a massive NLGQH\ shape (above).
< In this series of sketches, the butterfly device is shown to be an easily established point of reference and an aid in drawing any rear view of the pelvic forms of the lower torso (left).
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The kidney shape of the combined torso masses is characterized by the distinctively narrow waist of the body the flexible central axis between the upper torso (the rib cage barrel) and the lower torso (the pelvic wedge). The waist, because of its axislike quality, is capable of great versatility of movement.
