Florentine fourteenth century) with a habit of round arch and horizontals like that of Pisan architecture, could never take with enthusiasm to the pointed ogeeval ellipse, the oblique directions and unstable equilibrium, the drama of touch and go strain and resistance, of French Gothic; whence a constant readmission of the round arched shapes into the imported style, and a speedy return to the familiar empathic schemes in the architecture of the early Renaissance. On the other hand the persistence of Gothic detail in Northern architecture of the sixteenth and occasionally the seventeenth century, shows how insipid the round arch and straight entablature must have felt to people accustomed to the empathy of Gothic shapes. Nothing is so routinist as imagination and emotion; and empathy, which partakes of both, is therefore more dependent on familiarity than is the perception by which it is started: Spohr, and the other professional contemporaries of Beethoven, probably heard and technically understood all the peculiarities of his last quartets; but they liked them none the better. On the other hand continued repetition notoriously begets indifference. We cease to look at a shape which we "know by heart" and we cease to interpret in terms of our own activities and intentions when curiosity and expectation no longer let loose our dynamic imagination. Hence while utter unfamiliarity baffles aesthetic responsiveness, excessive familiarity prevents its starting at all. Indeed both perceptive clearness and empathic intensity reach their climax in the case of shapes which afford the excitement of tracking familiarity in novelty, the stimulation of acute comparison, the emotional ups and downs of expectation and partial recognition, or of recognition when unexpected, the latter having, as we know when we notice that a stranger has the trick of speech or gesture of an acquaintance, a very penetrating emotional warmth. Such discovery of the novel in the familiar, and of the familiar in the new, will he frequent in proportion to the definiteness and complexity of the shapes, and in proportion also to the sensitiveness and steadiness of the beholder's attention; while on the contrary "obvious" qualities of shape and superficial attention both tend to exhaust interest and demand change. This exhaustion of interest and consequent demand for change unites with the changing non-aesthetic aims imposed on art, together producing innovation. And the more superficial the aesthetic attention given by the beholders, the quicker will style succeed style, and shapes and shape-schemes be done to death by exaggeration or left in the lurch before their maturity; a state of affairs especially noticeable in our own day.