By 1236 the nave of Amiens was finished, whereupon the Romanesque choir was replaced by a Gothic one whose plan had been drawn by Robert de Lusarches at the same time with that of the nave. His feeling for proportion was unfaltering; the relation between every part of his church is perfect. The interior elevation in three vertical stories was to become classic--a pier arcade--which is one-third of the entire height, and of the remaining upper wall a clearstory which occupies two-thirds and a triforium one-third. The church is three times as wide as the side aisle is high, and height and span correlate with length. Subtlety of calculation is seen everywhere. The perspective view became a kind of classic type. As you gaze down the church toward the curving east wall which closes the vista, you see beneath the pier arcades of the _sanctum sanctorum_ the windows of the apse chapels behind; they appear to fill the apertures symmetrically, whereas at Beauvais, where the side aisle is exceedingly high, the windows of the chapels rise to merely half the height of the pier arches. The cathedrals of Tours and Clermont followed the more satisfactory arrangement of Amiens. In the last days of Gothic architecture the dislike of the horizontal line was to be carried to such an extent that even the capitals, which the custom of all nations had approved for three thousand years, were eliminated. At Amiens a sane balance was kept. Under its triforium runs a deeply carved band of foliage broken only at the triumphal arches of the transept-crossing. Only there does the ascending line rise unobstructed from pavement to vault. And yet no church ever soared more confidently. The very hall-mark of genius is Amiens' strong horizontal leaf garland--just the needed touch to give variety to regularity as grandiose as this. In the nave the frieze was cut before the posing of the stones, but in the choir the sculpture was done _in situ_. The fenestration of this cathedral of St. Louis' reign shows the national art in its prime. The glazed triforium is a kind of pedestal for the clearstory, with which it is bound in a single composition by means of continuous mullions. The original glass was of the Sainte-Chapelle type, made by the Paris school which led in the second half of the XIII century, and were it still in existence the interior of Amiens would be a gorgeous sight. Only vestiges have survived; in some of the choir chapels are patchwork panels of ancient fragments. No one denies that the light enters this cathedral too profusely for the mystic seclusion beloved of the soul.