The text discusses the human form's resemblance to animals, particularly in the most vigorous individuals, like athletes whose form resembles a lion but is refined. It explains that while human traits share similarities with animals, these traits are crafted so subtly they're not distinctly noticeable, though certain animal traits may dominate in an individual. It also describes the concept of a human figure at rest as maintaining perfect equilibrium, using a statue of Emperor Commodus as an example.
On the Human Figure
The human form of athletes, or the most vigorous men, resembles that of a lion, but with so much art and refinement that it is scarcely noticeable.
In plate VI, it is shown that man, composed of the elements of the universe, shares traits with all animals; however, these traits are so well arranged and indistinct that they are difficult to discern, as previously mentioned. This is true for the perfect man, in general; but individually, every man has some animal likeness that predominates in him and influences his character.
Plates VII and VIII confirm this principle in the buttocks and thighs, as well as in the arms and shoulders of strong and muscular men, whose apparent muscles resemble those same parts of the animals mentioned above.
CHAPTER III.
On the human figure considered at rest.
A figure is at rest when equilibrium is perfectly maintained; it does not move nor tilt in any direction but remains constantly in its position: this is the state of heavy and robust bodies. We have a fine example of this in the statue of Emperor Commodus, which can be seen in the Vatican gardens in Rome, commonly referred to as the Belvedere. He is depicted clothed and in full grandeur.