Should we even take note that when the arms are extended to the high, standing or supine the navel moves up?
To a more demanding analysis, not only aesthetic or of appearance, there are two points of importance and ceaseless vital function, both connected to the Golden Ratio like this, into a square let's say with side = 2 meters (ideal measure for a square, though not evenly for all men; but we trust that the Vitruvian man could bear it well):
Remembering that the square holds the soul of the Golden Proportion (page 16), it was instinctive – alike many other scholars in the world – checking among the two emblematic figures a sort of relation back, able to connect their realities.
So that the 'center of the body' should not to be considered only a numeric or geometric factor, but a dynamic one.
- that of the solar plexus, at the base of the diaphragm, just above the navel: the balance of respiration and continuity once it has started the earthly life. This is 2 × Φ (1.236), i.e. the Golden Section point of the height of our man. To call to mind as the Φ of our square.
It is the true virtual center of the body structure, around which the body develops after birth.
Hence it vitalizes the body from the outside and by the physical world, with a process that can partly control, being the center of the energy associated with ego.
It is related with the third chakra that concerns the propulsive, expansive, formative force, the ability to digest and transform into energy, maturation, then the source of personal power, self-belief, and self-worth.
This center, called in fact the Navel Chakra as well as the Solar Plexus Chakra, is known as located between the navel and solar plexus,
By the way, all this issue draws on the sketch of Leonardo, whose detailed proportions were not reliable as expected: e.g.
if the head in the figure would reach the upper side of the square as described, without interposing a thick tuft of hair, the navel itself could move upward enough to satisfy a pattern of the body in the square, likely meeting at once the Vitruvian statement and the true golden proportion.
But we cannot change it; and this corroborates an alternative perspective choice, provided it is founded and not contradictory.
- that of the cardiac center, that vitalizes body and soul from within, as the door of the spiritual sphere and from which the first stage of life originates; once confirmed to be in relation to the [four] golden circles centered on the solar plexus, this will reveal to be ( 2 × Φ ) 2 ( 1.528).
It will be the Φ of our circumference.
What better than the Golden Ratio to suit this aim?
,How could this take place?