When the head of the statue presents a just value with the whole, and is well allied with the neck, the sculptor proceeds upon the torso and arms, without losing sight of the general plan and construction. Indeed, the whole is ever borne in mind, and no given part is ever dwelt upon at the expense of another. Thus an equal tone is maintained, and harmony achieved in every form and value.
This method seems to have been the one adopted by Michel angelo, Donatello, Jacopo della Quercia, and the brothers Pisano before them, who have left sound traces of their labour.
In this fashion were created the masterworks of the past. The Parthenon, in which sculpture and architecture are united in one glorious harmony, is the expression of the highest art. Pheidias, the sculptor, worked hand in hand with Ictinus, the architect, and under them a legion of master carvers wrought on the Parian marble reliefs, statues and groups that are a glory to this day. Take, for example, the great relief that covered the wall of the inner portico; it was the chisel of the carver that glorified it. The artist, indeed, contributed in the conception of the work with sketches and designs in charcoal upon the marble; but, working on relief and background, it was the carver that left his impress upon it. A study of the friezes in the Parthenon shows, by its unequal quality, that the carving was executed by various hands: some groups present all the perfection of the Pheidian hand; others, though still of a high order and holding their own with dignity, are lacking, however, in the precision noted elsewhere.
Nevertheless, a small fragment of any Parthenon frieze would be enough to build the reputation of an artist.
Upon observing the works of Michelangelo it often seems as though the rough and varying form of the raw block of marble as it came from the quarry gave to him the conception of the figure and group. This is more apparent in the four statues of the Slaves which were brought to light not many years ago. In two of them in particular are still to be seen the planes and cavities as they were wrought by nature in the marble quarry.
There is also the Madonna de'Medici, created in Michelangelo's maturity and which seems to have attained the apex of an artist's and carver's potentiality, both in the largeness of conception and the compactness of form, insuring solidity. No particular of the work is isolated; harmony is maintained throughout. Yet even in this group is to be found the suggestion of the mountain. The principal line has still the imprint of the natural plane, and religiously Michelangelo seems to have maintained it, even though he made it serve the purposes of his group: it is the line that de scends from the right shoulder of the Madonna to the sole. It is also to be observed how well allied he kept the foot of the Child in its firmness and strength, making every detail serve toward the ultimate harmony of the finished statue. Only through thor ough cognizance of his substance and a mastery of his tools was it possible to the artist to achieve his perfection.