Since we can devote but a passing glance to the significance of form in the art of cultured man, I confine myself to some remarks on the æsthetic effect of the simplest of all forms—the straight line. Fr. Carstanjen, in his interesting paper on the developmental factors of the early renaissance in the Netherlands,[139] advances the opinion that progress and development in art are the direct result, psychologically speaking, of dissatisfaction with contemporary art and its productions with which the people have become satiated. As concerns the evolution of form, the common process seems to be that, by a naturalism more or less fortunate, something like style is first acquired by means of the mastery of straight lines. From this point development is in the direction of overcoming their stiffness and angularity. The representation of form is constantly more free, reaching thus a high degree of beauty, but passing on through a period of extravagant exaltation of circles, spirals, swells, and curves to final and inevitable decadence. In following out this succession of styles it becomes apparent that separation from the direct is, æsthetically speaking, separation from repose (as well as from stiffness). So Wölfflin says, in pointing out emotional analogies as they bear on form: “A line composed of short, delicate curves is commonly called tremulous, while one with wider and shallower vibrations indicates dull humming or buzzing. A zigzag rustles and splashes like falling water, and when very pointed sounds shrill like whistling. The straight line is quite still; in architecture it suggests the quiet simplicity of the antique.”[140] It is a most interesting study to note the almost illimitable force of this effect of the straight line in an art which, having reached the pinnacle of its development, allows full swing to the tendency toward rounded forms as well. During the most flourishing period of the Italian renaissance there was scarcely a single master who gloried more in the pride of sensuous loveliness than did Titian, yet even in the midst of his intoxicating triumphs he attained something of that quiet grandeur which, according to Winckelmann, formed the basis of Greek art. How can we account for this? In my opinion it was accomplished, in part at least, though not entirely, by the use of the short straight line which characterizes Titian’s style, and is repeated in the work of many of his imitators—I mean the line that is formed by the peculiar inclination of the head. It is found in the wonderful Madonna of the house of Pesaro, in the Flora of the Uffizi, the Laura de Dianti in the Louvre, in the so-called “Loves” and other works of the master. Their chief common characteristic is a certain commanding dignity impossible to describe. Among those artists influenced by Titian, Moretto has followed him most successfully.